diff --git a/Cargo.lock b/Cargo.lock
index 4b3e337..b87428c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -195,6 +195,7 @@ dependencies = [
  "git2",
  "regex",
  "serde",
+ "serde_yaml",
  "shellexpand",
  "tempdir",
  "toml",
@@ -336,6 +337,12 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "linked-hash-map"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fb9b38af92608140b86b693604b9ffcc5824240a484d1ecd4795bacb2fe88f3"
+
 [[package]]
 name = "lock_api"
 version = "0.4.5"
@@ -592,6 +599,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"
+
 [[package]]
 name = "scopeguard"
 version = "1.1.0"
@@ -600,24 +613,36 @@ checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
 [[package]]
 name = "serde"
-version = "1.0.134"
+version = "1.0.135"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96b3c34c1690edf8174f5b289a336ab03f568a4460d8c6df75f2f3a692b3bc6a"
+checksum = "2cf9235533494ea2ddcdb794665461814781c53f19d87b76e571a1c35acbad2b"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.134"
+version = "1.0.135"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "784ed1fbfa13fe191077537b0d70ec8ad1e903cfe04831da608aa36457cb653d"
+checksum = "8dcde03d87d4c973c04be249e7d8f0b35db1c848c487bd43032808e59dd8328d"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn",
 ]
 
+[[package]]
+name = "serde_yaml"
+version = "0.8.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4a521f2940385c165a24ee286aa8599633d162077a54bdcae2a6fd5a7bfa7a0"
+dependencies = [
+ "indexmap",
+ "ryu",
+ "serde",
+ "yaml-rust",
+]
+
 [[package]]
 name = "shellexpand"
 version = "2.1.0"
@@ -850,3 +875,12 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "yaml-rust"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
+dependencies = [
+ "linked-hash-map",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 2f6d8ff..27c5e13 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,7 +40,7 @@ path = "src/grm/main.rs"
 version = "=0.5.8"
 
 [dependencies.serde]
-version = "=1.0.134"
+version = "=1.0.135"
 features = ["derive"]
 
 [dependencies.git2]
@@ -62,5 +62,8 @@ version = "=1.5.4"
 [dependencies.comfy-table]
 version = "=5.0.0"
 
+[dependencies.serde_yaml]
+version = "=0.8.23"
+
 [dev-dependencies.tempdir]
 version = "=0.3.7"
diff --git a/Justfile b/Justfile
index 3f97304..bf74f55 100644
--- a/Justfile
+++ b/Justfile
@@ -52,3 +52,6 @@ check-pip-requirements: e2e-venv
     @cd ./e2e_tests \
     && . ./venv/bin/activate \
     && pip list --outdated | grep -q '.' && exit 1 || exit 0
+
+clean:
+    cargo clean
diff --git a/depcheck/update-cargo-dependencies.py b/depcheck/update-cargo-dependencies.py
index 8f8f533..5041fe7 100755
--- a/depcheck/update-cargo-dependencies.py
+++ b/depcheck/update-cargo-dependencies.py
@@ -14,7 +14,13 @@ AUTOUPDATE_DISABLED = []
 
 if os.path.exists(INDEX_DIR):
     subprocess.run(
-        ["git", "pull", "--depth=1", "origin"],
+        ["git", "fetch", "--depth=1", "origin"],
+        cwd=INDEX_DIR,
+        check=True,
+        capture_output=True,
+    )
+    subprocess.run(
+        ["git", "reset", "--hard", "origin/master"],
         cwd=INDEX_DIR,
         check=True,
         capture_output=True,
@@ -33,7 +39,7 @@ update_necessary = False
 
 # This updates the crates.io index, see https://github.com/rust-lang/cargo/issues/3377
 subprocess.run(
-    ["cargo", "search", "--limit", "0"],
+    ["cargo", "update", "--dry-run"],
     check=True,
     capture_output=False,  # to get some git output
 )
diff --git a/docs/src/overview.md b/docs/src/overview.md
index 7583d19..082678a 100644
--- a/docs/src/overview.md
+++ b/docs/src/overview.md
@@ -5,7 +5,8 @@ Manager](https://github.com/hakoerber/git-repo-manager/) (GRM for short), a
 tool that helps you manage git repositories.
 
 GRM helps you manage git repositories in a declarative way. Configure your
-repositories in a TOML file, GRM does the rest. Take a look at [the example
+repositories in a TOML or YAML file, GRM does the rest. Take a look at [the
+example
 configuration](https://github.com/hakoerber/git-repo-manager/blob/master/example.config.toml)
 to get a feel for the way you configure your repositories. See the [repository
 tree chapter](./repos.md) for details.
diff --git a/docs/src/repos.md b/docs/src/repos.md
index 32d6ccb..69004f8 100644
--- a/docs/src/repos.md
+++ b/docs/src/repos.md
@@ -74,3 +74,9 @@ $ grm repos status
 ╰──────────┴──────────┴────────┴──────────┴───────┴─────────╯
 ```
 
+## YAML
+
+By default, the repo configuration uses TOML. If you prefer YAML, just give it
+a YAML file instead (file ending does not matter, `grm` will figure out the format
+itself). For generating a configuration, pass `--format yaml` to `grm repo find`
+to generate YAML instead of TOML.
diff --git a/docs/src/worktrees.md b/docs/src/worktrees.md
index 847cdad..72258f8 100644
--- a/docs/src/worktrees.md
+++ b/docs/src/worktrees.md
@@ -309,6 +309,10 @@ grm wt pull --rebase
 [✔] my-cool-branch: Done
 ```
 
+As noted, this will fail if there are any local changes in your worktree. If you
+want to stash these changes automatically before the pull (and unstash them
+afterwards), use the `--stash` option.
+
 This will rebase your changes onto the upstream branch. This is mainly helpful
 for persistent branches that change on the remote side.
 
@@ -346,6 +350,10 @@ run two commands.
 I understand that the UX is not the most intuitive. If you can think of an
 improvement, please let me know (e.g. via an GitHub issue)!
 
+As with `pull`, `rebase` will also refuse to run when there are changes in your
+worktree. And you can also use the `--stash` option to stash/unstash changes
+automatically.
+
 ### Manual access
 
 GRM isn't doing any magic, it's just git under the hood. If you need to have access
diff --git a/e2e_tests/requirements.txt b/e2e_tests/requirements.txt
index aeccd82..fe7936d 100644
--- a/e2e_tests/requirements.txt
+++ b/e2e_tests/requirements.txt
@@ -7,6 +7,7 @@ pluggy==1.0.0
 py==1.11.0
 pyparsing==3.0.7
 pytest==6.2.5
+PyYAML==6.0
 smmap==5.0.0
 toml==0.10.2
 typing_extensions==4.0.1
diff --git a/e2e_tests/test_repos_find.py b/e2e_tests/test_repos_find.py
index 2939e95..cf6e692 100644
--- a/e2e_tests/test_repos_find.py
+++ b/e2e_tests/test_repos_find.py
@@ -3,6 +3,8 @@
 import tempfile
 
 import toml
+import pytest
+import yaml
 
 from helpers import *
 
@@ -30,6 +32,16 @@ def test_repos_find_empty():
         assert len(cmd.stderr) != 0
 
 
+def test_repos_find_invalid_format():
+    with tempfile.TemporaryDirectory() as tmpdir:
+        cmd = grm(
+            ["repos", "find", tmpdir, "--format", "invalidformat"], is_invalid=True
+        )
+        assert cmd.returncode != 0
+        assert len(cmd.stdout) == 0
+        assert "isn't a valid value" in cmd.stderr
+
+
 def test_repos_find_non_git_repos():
     with tempfile.TemporaryDirectory() as tmpdir:
         shell(
@@ -50,7 +62,9 @@ def test_repos_find_non_git_repos():
         assert len(cmd.stderr) != 0
 
 
-def test_repos_find():
+@pytest.mark.parametrize("default", [True, False])
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_find(configtype, default):
     with tempfile.TemporaryDirectory() as tmpdir:
         shell(
             f"""
@@ -83,11 +97,19 @@ def test_repos_find():
         """
         )
 
-        cmd = grm(["repos", "find", tmpdir])
+        args = ["repos", "find", tmpdir]
+        if not default:
+            args += ["--format", configtype]
+        cmd = grm(args)
         assert cmd.returncode == 0
         assert len(cmd.stderr) == 0
 
-        output = toml.loads(cmd.stdout)
+        if default or configtype == "toml":
+            output = toml.loads(cmd.stdout)
+        elif configtype == "yaml":
+            output = yaml.safe_load(cmd.stdout)
+        else:
+            raise NotImplementedError()
 
         assert isinstance(output, dict)
         assert set(output.keys()) == {"trees"}
@@ -125,14 +147,24 @@ def test_repos_find():
             assert origin["url"] == "https://example.com/repo2.git"
 
 
-def test_repos_find_in_root():
+@pytest.mark.parametrize("default", [True, False])
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_find_in_root(configtype, default):
     with TempGitRepository() as repo_dir:
 
-        cmd = grm(["repos", "find", repo_dir])
+        args = ["repos", "find", repo_dir]
+        if not default:
+            args += ["--format", configtype]
+        cmd = grm(args)
         assert cmd.returncode == 0
         assert len(cmd.stderr) == 0
 
-        output = toml.loads(cmd.stdout)
+        if default or configtype == "toml":
+            output = toml.loads(cmd.stdout)
+        elif configtype == "yaml":
+            output = yaml.safe_load(cmd.stdout)
+        else:
+            raise NotImplementedError()
 
         assert isinstance(output, dict)
         assert set(output.keys()) == {"trees"}
@@ -160,7 +192,9 @@ def test_repos_find_in_root():
             assert someremote["type"] == "file"
 
 
-def test_repos_find_with_invalid_repo():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+@pytest.mark.parametrize("default", [True, False])
+def test_repos_find_with_invalid_repo(configtype, default):
     with tempfile.TemporaryDirectory() as tmpdir:
         shell(
             f"""
@@ -193,11 +227,19 @@ def test_repos_find_with_invalid_repo():
         """
         )
 
-        cmd = grm(["repos", "find", tmpdir])
+        args = ["repos", "find", tmpdir]
+        if not default:
+            args += ["--format", configtype]
+        cmd = grm(args)
         assert cmd.returncode == 0
         assert "broken" in cmd.stderr
 
-        output = toml.loads(cmd.stdout)
+        if default or configtype == "toml":
+            output = toml.loads(cmd.stdout)
+        elif configtype == "yaml":
+            output = yaml.safe_load(cmd.stdout)
+        else:
+            raise NotImplementedError()
 
         assert isinstance(output, dict)
         assert set(output.keys()) == {"trees"}
diff --git a/e2e_tests/test_repos_sync.py b/e2e_tests/test_repos_sync.py
index 62e0cca..2586943 100644
--- a/e2e_tests/test_repos_sync.py
+++ b/e2e_tests/test_repos_sync.py
@@ -2,6 +2,7 @@
 
 import tempfile
 import re
+import textwrap
 
 import pytest
 import toml
@@ -9,8 +10,134 @@ import git
 
 from helpers import *
 
+templates = {
+    "repo_simple": {
+        "toml": """
+            [[trees]]
+            root = "{root}"
 
-def test_repos_sync_config_is_valid_symlink():
+            [[trees.repos]]
+            name = "test"
+        """,
+        "yaml": """
+            trees:
+            - root: "{root}"
+              repos:
+              - name: "test"
+        """,
+    },
+    "repo_with_remote": {
+        "toml": """
+            [[trees]]
+            root = "{root}"
+
+            [[trees.repos]]
+            name = "test"
+
+            [[trees.repos.remotes]]
+            name = "{remotename}"
+            url = "file://{remote}"
+            type = "file"
+        """,
+        "yaml": textwrap.dedent(
+            """
+            trees:
+            - root: "{root}"
+              repos:
+              - name: test
+                remotes:
+                - name: "{remotename}"
+                  url: "file://{remote}"
+                  type: "file"
+        """
+        ),
+    },
+    "repo_with_two_remotes": {
+        "toml": """
+            [[trees]]
+            root = "{root}"
+
+            [[trees.repos]]
+            name = "test"
+
+            [[trees.repos.remotes]]
+            name = "origin"
+            url = "file://{remote1}"
+            type = "file"
+
+            [[trees.repos.remotes]]
+            name = "origin2"
+            url = "file://{remote2}"
+            type = "file"
+        """,
+        "yaml": textwrap.dedent(
+            """
+            trees:
+            - root: "{root}"
+              repos:
+              - name: "test"
+                remotes:
+                - name: "origin"
+                  url: "file://{remote1}"
+                  type: "file"
+                - name: "origin2"
+                  url: "file://{remote2}"
+                  type: "file"
+        """
+        ),
+    },
+    "worktree_repo_simple": {
+        "toml": """
+            [[trees]]
+            root = "{root}"
+
+            [[trees.repos]]
+            name = "test"
+            worktree_setup = true
+        """,
+        "yaml": textwrap.dedent(
+            """
+            trees:
+            - root: "{root}"
+              repos:
+              - name: test
+                worktree_setup: true
+        """
+        ),
+    },
+    "worktree_repo_with_remote": {
+        "toml": """
+            [[trees]]
+            root = "{root}"
+
+            [[trees.repos]]
+            name = "test"
+            worktree_setup = true
+
+            [[trees.repos.remotes]]
+            name = "origin"
+            url = "file://{remote}"
+            type = "file"
+        """,
+        "yaml": textwrap.dedent(
+            """
+            trees:
+            - root: "{root}"
+              repos:
+              - name: test
+                worktree_setup: true
+                remotes:
+                - name: origin
+                  url: "file://{remote}"
+                  type: "file"
+        """
+        ),
+    },
+}
+
+
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_config_is_valid_symlink(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote, head_commit_sha):
             with tempfile.NamedTemporaryFile() as config:
@@ -20,20 +147,13 @@ def test_repos_sync_config_is_valid_symlink():
 
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote}"
-                            type = "file"
-                        """
+                            templates["repo_with_remote"][configtype].format(
+                                root=target, remote=remote, remotename="origin"
+                            )
                         )
 
+                    subprocess.run(["cat", config.name])
+
                     cmd = grm(["repos", "sync", "--config", config_symlink])
                     assert cmd.returncode == 0
 
@@ -85,20 +205,13 @@ def test_repos_sync_config_is_unreadable():
         assert "permission denied" in cmd.stderr.lower()
 
 
-def test_repos_sync_unmanaged_repos():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_unmanaged_repos(configtype):
     with tempfile.TemporaryDirectory() as root:
         with TempGitRepository(dir=root) as unmanaged_repo:
             with tempfile.NamedTemporaryFile() as config:
                 with open(config.name, "w") as f:
-                    f.write(
-                        f"""
-                        [[trees]]
-                        root = "{root}"
-
-                        [[trees.repos]]
-                        name = "test"
-                    """
-                    )
+                    f.write(templates["repo_simple"][configtype].format(root=root))
 
                 cmd = grm(["repos", "sync", "--config", config.name])
                 assert cmd.returncode == 0
@@ -112,19 +225,12 @@ def test_repos_sync_unmanaged_repos():
                 assert any([re.match(regex, l) for l in cmd.stderr.lower().split("\n")])
 
 
-def test_repos_sync_root_is_file():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_root_is_file(configtype):
     with tempfile.NamedTemporaryFile() as target:
         with tempfile.NamedTemporaryFile() as config:
             with open(config.name, "w") as f:
-                f.write(
-                    f"""
-                    [[trees]]
-                    root = "{target.name}"
-
-                    [[trees.repos]]
-                    name = "test"
-                """
-                )
+                f.write(templates["repo_simple"][configtype].format(root=target.name))
 
             cmd = grm(["repos", "sync", "--config", config.name])
             assert cmd.returncode != 0
@@ -132,30 +238,17 @@ def test_repos_sync_root_is_file():
             assert "not a directory" in cmd.stderr.lower()
 
 
-def test_repos_sync_normal_clone():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_normal_clone(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote1, remote1_head_commit_sha):
             with TempGitFileRemote() as (remote2, remote2_head_commit_sha):
                 with tempfile.NamedTemporaryFile() as config:
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-
-                            [[trees.repos.remotes]]
-                            name = "origin2"
-                            url = "file://{remote2}"
-                            type = "file"
-                        """
+                            templates["repo_with_two_remotes"][configtype].format(
+                                root=target, remote1=remote1, remote2=remote2
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -183,19 +276,12 @@ def test_repos_sync_normal_clone():
                         assert urls[0] == f"file://{remote2}"
 
 
-def test_repos_sync_normal_init():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_normal_init(configtype):
     with tempfile.TemporaryDirectory() as target:
         with tempfile.NamedTemporaryFile() as config:
             with open(config.name, "w") as f:
-                f.write(
-                    f"""
-                    [[trees]]
-                    root = "{target}"
-
-                    [[trees.repos]]
-                    name = "test"
-                """
-                )
+                f.write(templates["repo_simple"][configtype].format(root=target))
 
             cmd = grm(["repos", "sync", "--config", config.name])
             assert cmd.returncode == 0
@@ -210,25 +296,17 @@ def test_repos_sync_normal_init():
                 assert not repo.head.is_valid()
 
 
-def test_repos_sync_normal_add_remote():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_normal_add_remote(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote1, remote1_head_commit_sha):
             with TempGitFileRemote() as (remote2, remote2_head_commit_sha):
                 with tempfile.NamedTemporaryFile() as config:
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-                        """
+                            templates["repo_with_remote"][configtype].format(
+                                root=target, remote=remote1, remotename="origin"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -246,23 +324,9 @@ def test_repos_sync_normal_add_remote():
 
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-
-                            [[trees.repos.remotes]]
-                            name = "origin2"
-                            url = "file://{remote2}"
-                            type = "file"
-                        """
+                            templates["repo_with_two_remotes"][configtype].format(
+                                root=target, remote1=remote1, remote2=remote2
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -282,30 +346,17 @@ def test_repos_sync_normal_add_remote():
                         assert urls[0] == f"file://{remote2}"
 
 
-def test_repos_sync_normal_remove_remote():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_normal_remove_remote(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote1, remote1_head_commit_sha):
             with TempGitFileRemote() as (remote2, remote2_head_commit_sha):
                 with tempfile.NamedTemporaryFile() as config:
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-
-                            [[trees.repos.remotes]]
-                            name = "origin2"
-                            url = "file://{remote2}"
-                            type = "file"
-                        """
+                            templates["repo_with_two_remotes"][configtype].format(
+                                root=target, remote1=remote1, remote2=remote2
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -326,18 +377,9 @@ def test_repos_sync_normal_remove_remote():
 
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin2"
-                            url = "file://{remote2}"
-                            type = "file"
-                        """
+                            templates["repo_with_remote"][configtype].format(
+                                root=target, remote=remote2, remotename="origin2"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -369,25 +411,17 @@ def test_repos_sync_normal_remove_remote():
                         assert urls[0] == f"file://{remote2}"
 
 
-def test_repos_sync_normal_change_remote_url():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_normal_change_remote_url(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote1, remote1_head_commit_sha):
             with TempGitFileRemote() as (remote2, remote2_head_commit_sha):
                 with tempfile.NamedTemporaryFile() as config:
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-                        """
+                            templates["repo_with_remote"][configtype].format(
+                                root=target, remote=remote1, remotename="origin"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -405,18 +439,9 @@ def test_repos_sync_normal_change_remote_url():
 
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote2}"
-                            type = "file"
-                        """
+                            templates["repo_with_remote"][configtype].format(
+                                root=target, remote=remote2, remotename="origin"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -429,25 +454,17 @@ def test_repos_sync_normal_change_remote_url():
                         assert urls[0] == f"file://{remote2}"
 
 
-def test_repos_sync_normal_change_remote_name():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_normal_change_remote_name(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote1, remote1_head_commit_sha):
             with TempGitFileRemote() as (remote2, remote2_head_commit_sha):
                 with tempfile.NamedTemporaryFile() as config:
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-                        """
+                            templates["repo_with_remote"][configtype].format(
+                                root=target, remote=remote1, remotename="origin"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -465,18 +482,9 @@ def test_repos_sync_normal_change_remote_name():
 
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin2"
-                            url = "file://{remote1}"
-                            type = "file"
-                        """
+                            templates["repo_with_remote"][configtype].format(
+                                root=target, remote=remote1, remotename="origin2"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -492,25 +500,16 @@ def test_repos_sync_normal_change_remote_name():
                         assert urls[0] == f"file://{remote1}"
 
 
-def test_repos_sync_worktree_clone():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_worktree_clone(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote, head_commit_sha):
             with tempfile.NamedTemporaryFile() as config:
                 with open(config.name, "w") as f:
                     f.write(
-                        f"""
-                        [[trees]]
-                        root = "{target}"
-
-                        [[trees.repos]]
-                        name = "test"
-                        worktree_setup = true
-
-                        [[trees.repos.remotes]]
-                        name = "origin"
-                        url = "file://{remote}"
-                        type = "file"
-                    """
+                        templates["worktree_repo_with_remote"][configtype].format(
+                            root=target, remote=remote, remotename="origin"
+                        )
                     )
 
                 cmd = grm(["repos", "sync", "--config", config.name])
@@ -530,19 +529,13 @@ def test_repos_sync_worktree_clone():
                     assert str(repo.head.commit) == head_commit_sha
 
 
-def test_repos_sync_worktree_init():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_worktree_init(configtype):
     with tempfile.TemporaryDirectory() as target:
         with tempfile.NamedTemporaryFile() as config:
             with open(config.name, "w") as f:
                 f.write(
-                    f"""
-                    [[trees]]
-                    root = "{target}"
-
-                    [[trees.repos]]
-                    name = "test"
-                    worktree_setup = true
-                """
+                    templates["worktree_repo_simple"][configtype].format(root=target)
                 )
 
             cmd = grm(["repos", "sync", "--config", config.name])
@@ -559,43 +552,42 @@ def test_repos_sync_worktree_init():
                 assert not repo.head.is_valid()
 
 
-def test_repos_sync_invalid_toml():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_invalid_syntax(configtype):
     with tempfile.NamedTemporaryFile() as config:
         with open(config.name, "w") as f:
-            f.write(
-                f"""
-                [[trees]]
-                root = invalid as there are no quotes ;)
-            """
-            )
+            if configtype == "toml":
+                f.write(
+                    f"""
+                    [[trees]]
+                    root = invalid as there are no quotes ;)
+                """
+                )
+            elif configtype == "yaml":
+                f.write(
+                    f"""
+                    trees:
+                    wrong:
+                    indentation:
+                """
+                )
+            else:
+                raise NotImplementedError()
             cmd = grm(["repos", "sync", "--config", config.name])
             assert cmd.returncode != 0
 
 
-def test_repos_sync_unchanged():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_unchanged(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote1, remote1_head_commit_sha):
             with TempGitFileRemote() as (remote2, remote2_head_commit_sha):
                 with tempfile.NamedTemporaryFile() as config:
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-
-                            [[trees.repos.remotes]]
-                            name = "origin2"
-                            url = "file://{remote2}"
-                            type = "file"
-                        """
+                            templates["repo_with_two_remotes"][configtype].format(
+                                root=target, remote1=remote1, remote2=remote2
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -609,25 +601,17 @@ def test_repos_sync_unchanged():
                     assert before == after
 
 
-def test_repos_sync_normal_change_to_worktree():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_normal_change_to_worktree(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote1, remote1_head_commit_sha):
             with TempGitFileRemote() as (remote2, remote2_head_commit_sha):
                 with tempfile.NamedTemporaryFile() as config:
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-                        """
+                            templates["repo_with_remote"][configtype].format(
+                                root=target, remote=remote1, remotename="origin"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -637,19 +621,9 @@ def test_repos_sync_normal_change_to_worktree():
 
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-                            worktree_setup = true
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-                        """
+                            templates["worktree_repo_with_remote"][configtype].format(
+                                root=target, remote=remote1, remotename="origin"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -658,26 +632,17 @@ def test_repos_sync_normal_change_to_worktree():
                     assert "not using a worktree setup" in cmd.stderr
 
 
-def test_repos_sync_worktree_change_to_normal():
+@pytest.mark.parametrize("configtype", ["toml", "yaml"])
+def test_repos_sync_worktree_change_to_normal(configtype):
     with tempfile.TemporaryDirectory() as target:
         with TempGitFileRemote() as (remote1, remote1_head_commit_sha):
             with TempGitFileRemote() as (remote2, remote2_head_commit_sha):
                 with tempfile.NamedTemporaryFile() as config:
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-                            worktree_setup = true
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-                        """
+                            templates["worktree_repo_with_remote"][configtype].format(
+                                root=target, remote=remote1, remotename="origin"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
@@ -687,18 +652,9 @@ def test_repos_sync_worktree_change_to_normal():
 
                     with open(config.name, "w") as f:
                         f.write(
-                            f"""
-                            [[trees]]
-                            root = "{target}"
-
-                            [[trees.repos]]
-                            name = "test"
-
-                            [[trees.repos.remotes]]
-                            name = "origin"
-                            url = "file://{remote1}"
-                            type = "file"
-                        """
+                            templates["repo_with_remote"][configtype].format(
+                                root=target, remote=remote1, remotename="origin"
+                            )
                         )
 
                     cmd = grm(["repos", "sync", "--config", config.name])
diff --git a/e2e_tests/test_worktree_fetch.py b/e2e_tests/test_worktree_fetch.py
index 1c165a9..df01462 100644
--- a/e2e_tests/test_worktree_fetch.py
+++ b/e2e_tests/test_worktree_fetch.py
@@ -2,6 +2,8 @@
 
 from helpers import *
 
+import re
+
 import pytest
 import git
 
@@ -51,7 +53,9 @@ def test_worktree_fetch():
 
 @pytest.mark.parametrize("rebase", [True, False])
 @pytest.mark.parametrize("ffable", [True, False])
-def test_worktree_pull(rebase, ffable):
+@pytest.mark.parametrize("has_changes", [True, False])
+@pytest.mark.parametrize("stash", [True, False])
+def test_worktree_pull(rebase, ffable, has_changes, stash):
     with TempGitRepositoryWorktree() as (base_dir, root_commit):
         with TempGitFileRemote() as (remote_path, _remote_sha):
             shell(
@@ -94,51 +98,79 @@ def test_worktree_pull(rebase, ffable):
                     """
                     )
 
+                if has_changes:
+                    shell(
+                        f"""
+                        cd {base_dir}/master
+                        echo change >> root-commit-in-worktree-1
+                        echo uncommitedchange > uncommitedchange
+                    """
+                    )
+
                 args = ["wt", "pull"]
                 if rebase:
                     args += ["--rebase"]
+                if stash:
+                    args += ["--stash"]
                 cmd = grm(args, cwd=base_dir)
-                assert cmd.returncode == 0
-
-                assert repo.commit("upstream/master").hexsha == remote_commit
-                assert repo.commit("origin/master").hexsha == root_commit
-                assert (
-                    repo.commit("master").hexsha != repo.commit("origin/master").hexsha
-                )
-
-                if not rebase:
-                    if ffable:
-                        assert (
-                            repo.commit("master").hexsha
-                            != repo.commit("origin/master").hexsha
-                        )
-                        assert (
-                            repo.commit("master").hexsha
-                            == repo.commit("upstream/master").hexsha
-                        )
-                        assert repo.commit("upstream/master").hexsha == remote_commit
-                    else:
-                        assert "cannot be fast forwarded" in cmd.stderr
-                        assert (
-                            repo.commit("master").hexsha
-                            != repo.commit("origin/master").hexsha
-                        )
-                        assert repo.commit("master").hexsha != remote_commit
-                        assert repo.commit("upstream/master").hexsha == remote_commit
+                if has_changes and not stash:
+                    assert cmd.returncode != 0
+                    assert re.match(r".*master.*contains changes.*", cmd.stderr)
                 else:
-                    if ffable:
-                        assert (
-                            repo.commit("master").hexsha
-                            != repo.commit("origin/master").hexsha
-                        )
-                        assert (
-                            repo.commit("master").hexsha
-                            == repo.commit("upstream/master").hexsha
-                        )
-                        assert repo.commit("upstream/master").hexsha == remote_commit
+                    assert repo.commit("upstream/master").hexsha == remote_commit
+                    assert repo.commit("origin/master").hexsha == root_commit
+                    assert (
+                        repo.commit("master").hexsha
+                        != repo.commit("origin/master").hexsha
+                    )
+                    if has_changes:
+                        assert ["uncommitedchange"] == repo.untracked_files
+                        assert repo.is_dirty()
                     else:
-                        assert (
-                            repo.commit("master").message.strip()
-                            == "local-commit-in-master"
-                        )
-                        assert repo.commit("master~1").hexsha == remote_commit
+                        assert not repo.is_dirty()
+
+                    if not rebase:
+                        if ffable:
+                            assert cmd.returncode == 0
+                            assert (
+                                repo.commit("master").hexsha
+                                != repo.commit("origin/master").hexsha
+                            )
+                            assert (
+                                repo.commit("master").hexsha
+                                == repo.commit("upstream/master").hexsha
+                            )
+                            assert (
+                                repo.commit("upstream/master").hexsha == remote_commit
+                            )
+                        else:
+                            assert cmd.returncode != 0
+                            assert "cannot be fast forwarded" in cmd.stderr
+                            assert (
+                                repo.commit("master").hexsha
+                                != repo.commit("origin/master").hexsha
+                            )
+                            assert repo.commit("master").hexsha != remote_commit
+                            assert (
+                                repo.commit("upstream/master").hexsha == remote_commit
+                            )
+                    else:
+                        assert cmd.returncode == 0
+                        if ffable:
+                            assert (
+                                repo.commit("master").hexsha
+                                != repo.commit("origin/master").hexsha
+                            )
+                            assert (
+                                repo.commit("master").hexsha
+                                == repo.commit("upstream/master").hexsha
+                            )
+                            assert (
+                                repo.commit("upstream/master").hexsha == remote_commit
+                            )
+                        else:
+                            assert (
+                                repo.commit("master").message.strip()
+                                == "local-commit-in-master"
+                            )
+                            assert repo.commit("master~1").hexsha == remote_commit
diff --git a/e2e_tests/test_worktree_rebase.py b/e2e_tests/test_worktree_rebase.py
index c913aaf..a64f755 100644
--- a/e2e_tests/test_worktree_rebase.py
+++ b/e2e_tests/test_worktree_rebase.py
@@ -2,15 +2,18 @@
 
 from helpers import *
 
-import pytest
+import re
 
+import pytest
 import git
 
 
 @pytest.mark.parametrize("pull", [True, False])
 @pytest.mark.parametrize("rebase", [True, False])
 @pytest.mark.parametrize("ffable", [True, False])
-def test_worktree_rebase(pull, rebase, ffable):
+@pytest.mark.parametrize("has_changes", [True, False])
+@pytest.mark.parametrize("stash", [True, False])
+def test_worktree_rebase(pull, rebase, ffable, has_changes, stash):
     with TempGitRepositoryWorktree() as (base_dir, _root_commit):
         with open(os.path.join(base_dir, "grm.toml"), "w") as f:
             f.write('persistent_branches = ["mybasebranch"]')
@@ -83,6 +86,14 @@ def test_worktree_rebase(pull, rebase, ffable):
             """
             )
 
+        if has_changes:
+            shell(
+                f"""
+                cd {base_dir}/myfeatbranch
+                echo uncommitedchange > uncommitedchange
+            """
+            )
+
         grm(["wt", "delete", "--force", "tmp"], cwd=base_dir)
 
         repo = git.Repo(f"{base_dir}/.git-main-working-tree")
@@ -133,17 +144,23 @@ def test_worktree_rebase(pull, rebase, ffable):
             args += ["--pull"]
         if rebase:
             args += ["--rebase"]
+        if stash:
+            args += ["--stash"]
         cmd = grm(args, cwd=base_dir)
 
-        print(args)
         if rebase and not pull:
             assert cmd.returncode != 0
             assert len(cmd.stderr) != 0
+        elif has_changes and not stash:
+            assert cmd.returncode != 0
+            assert re.match(r".*myfeatbranch.*contains changes.*", cmd.stderr)
         else:
-            assert cmd.returncode == 0
             repo = git.Repo(f"{base_dir}/myfeatbranch")
+            if has_changes:
+                assert ["uncommitedchange"] == repo.untracked_files
             if pull:
                 if rebase:
+                    assert cmd.returncode == 0
                     if ffable:
                         assert (
                             repo.commit("HEAD").message.strip()
@@ -190,6 +207,7 @@ def test_worktree_rebase(pull, rebase, ffable):
                         assert repo.commit("HEAD~6").message.strip() == "commit-root"
                 else:
                     if ffable:
+                        assert cmd.returncode == 0
                         assert (
                             repo.commit("HEAD").message.strip()
                             == "commit-in-feat-remote"
@@ -208,6 +226,7 @@ def test_worktree_rebase(pull, rebase, ffable):
                         )
                         assert repo.commit("HEAD~4").message.strip() == "commit-root"
                     else:
+                        assert cmd.returncode != 0
                         assert (
                             repo.commit("HEAD").message.strip()
                             == "commit-in-feat-local-no-ff"
@@ -226,6 +245,7 @@ def test_worktree_rebase(pull, rebase, ffable):
                         )
                         assert repo.commit("HEAD~4").message.strip() == "commit-root"
             else:
+                assert cmd.returncode == 0
                 if ffable:
                     assert repo.commit("HEAD").message.strip() == "commit-in-feat-local"
                     assert (
diff --git a/e2e_tests/update_requirementstxt.sh b/e2e_tests/update_requirementstxt.sh
index 294da97..b2eca83 100755
--- a/e2e_tests/update_requirementstxt.sh
+++ b/e2e_tests/update_requirementstxt.sh
@@ -9,6 +9,8 @@ source ./venv/bin/activate
 pip --disable-pip-version-check install -r ./requirements.txt
 
 pip3 list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1 | while read -r package ; do
+    [[ package == "pip" ]] && continue
+    [[ package == "setuptools" ]] && continue
     pip install --upgrade "${package}"
     version="$(pip show "${package}" | grep '^Version' | cut -d ' ' -f 2)"
     message="e2e_tests/pip: Update ${package} to ${version}"
diff --git a/example.config.yaml b/example.config.yaml
new file mode 100644
index 0000000..2c4152d
--- /dev/null
+++ b/example.config.yaml
@@ -0,0 +1,16 @@
+trees:
+- root: "~/example-projects/"
+  repos:
+  - name: "git-repo-manager"
+    remotes:
+    - name: "origin"
+      url: "https://code.hkoerber.de/hannes/git-repo-manager.git"
+      type: "https"
+    - name: "github"
+      url: "https://github.com/hakoerber/git-repo-manager.git"
+      type: "https"
+  - name: "dotfiles"
+    remotes:
+    - name: "origin"
+      url: "https://github.com/hakoerber/dotfiles.git"
+      type: "https"
diff --git a/src/config.rs b/src/config.rs
index efcf6e6..e81c6a0 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -36,6 +36,10 @@ impl Config {
             Err(error) => Err(error.to_string()),
         }
     }
+
+    pub fn as_yaml(&self) -> Result<String, String> {
+        serde_yaml::to_string(self).map_err(|e| e.to_string())
+    }
 }
 
 #[derive(Debug, Serialize, Deserialize)]
@@ -62,12 +66,15 @@ pub fn read_config(path: &str) -> Result<Config, String> {
 
     let config: Config = match toml::from_str(&content) {
         Ok(c) => c,
-        Err(e) => {
-            return Err(format!(
-                "Error parsing configuration file \"{}\": {}",
-                path, e
-            ))
-        }
+        Err(_) => match serde_yaml::from_str(&content) {
+            Ok(c) => c,
+            Err(e) => {
+                return Err(format!(
+                    "Error parsing configuration file \"{}\": {}",
+                    path, e
+                ))
+            }
+        },
     };
 
     Ok(config)
diff --git a/src/grm/cmd.rs b/src/grm/cmd.rs
index 7588499..1ea9a02 100644
--- a/src/grm/cmd.rs
+++ b/src/grm/cmd.rs
@@ -61,10 +61,25 @@ pub struct OptionalConfig {
     pub config: Option<String>,
 }
 
+#[derive(clap::ArgEnum, Clone)]
+pub enum ConfigFormat {
+    Yaml,
+    Toml,
+}
+
 #[derive(Parser)]
 pub struct Find {
     #[clap(help = "The path to search through")]
     pub path: String,
+
+    #[clap(
+        arg_enum,
+        short,
+        long,
+        help = "Format to produce",
+        default_value_t = ConfigFormat::Toml,
+    )]
+    pub format: ConfigFormat,
 }
 
 #[derive(Parser)]
@@ -132,6 +147,8 @@ pub struct WorktreeFetchArgs {}
 pub struct WorktreePullArgs {
     #[clap(long = "--rebase", help = "Perform a rebase instead of a fast-forward")]
     pub rebase: bool,
+    #[clap(long = "--stash", help = "Stash & unstash changes before & after pull")]
+    pub stash: bool,
 }
 
 #[derive(Parser)]
@@ -140,6 +157,11 @@ pub struct WorktreeRebaseArgs {
     pub pull: bool,
     #[clap(long = "--rebase", help = "Perform a rebase when doing a pull")]
     pub rebase: bool,
+    #[clap(
+        long = "--stash",
+        help = "Stash & unstash changes before & after rebase"
+    )]
+    pub stash: bool,
 }
 
 pub fn parse() -> Opts {
diff --git a/src/grm/main.rs b/src/grm/main.rs
index 9a2996a..50547da 100644
--- a/src/grm/main.rs
+++ b/src/grm/main.rs
@@ -119,15 +119,34 @@ fn main() {
                 } else {
                     let config = trees.to_config();
 
-                    let toml = match config.as_toml() {
-                        Ok(toml) => toml,
-                        Err(error) => {
-                            print_error(&format!("Failed converting config to TOML: {}", &error));
-                            process::exit(1);
+                    match find.format {
+                        cmd::ConfigFormat::Toml => {
+                            let toml = match config.as_toml() {
+                                Ok(toml) => toml,
+                                Err(error) => {
+                                    print_error(&format!(
+                                        "Failed converting config to TOML: {}",
+                                        &error
+                                    ));
+                                    process::exit(1);
+                                }
+                            };
+                            print!("{}", toml);
                         }
-                    };
-
-                    print!("{}", toml);
+                        cmd::ConfigFormat::Yaml => {
+                            let yaml = match config.as_yaml() {
+                                Ok(yaml) => yaml,
+                                Err(error) => {
+                                    print_error(&format!(
+                                        "Failed converting config to YAML: {}",
+                                        &error
+                                    ));
+                                    process::exit(1);
+                                }
+                            };
+                            print!("{}", yaml);
+                        }
+                    }
                 }
                 for warning in warnings {
                     print_warning(&warning);
@@ -350,26 +369,27 @@ fn main() {
                         process::exit(1);
                     });
 
+                    let mut failures = false;
                     for worktree in repo.get_worktrees().unwrap_or_else(|error| {
                         print_error(&format!("Error getting worktrees: {}", error));
                         process::exit(1);
                     }) {
-                        if let Some(warning) =
-                            worktree
-                                .forward_branch(args.rebase)
-                                .unwrap_or_else(|error| {
-                                    print_error(&format!(
-                                        "Error updating worktree branch: {}",
-                                        error
-                                    ));
-                                    process::exit(1);
-                                })
+                        if let Some(warning) = worktree
+                            .forward_branch(args.rebase, args.stash)
+                            .unwrap_or_else(|error| {
+                                print_error(&format!("Error updating worktree branch: {}", error));
+                                process::exit(1);
+                            })
                         {
                             print_warning(&format!("{}: {}", worktree.name(), warning));
+                            failures = true;
                         } else {
                             print_success(&format!("{}: Done", worktree.name()));
                         }
                     }
+                    if failures {
+                        process::exit(1);
+                    }
                 }
                 cmd::WorktreeAction::Rebase(args) => {
                     if args.rebase && !args.pull {
@@ -406,10 +426,12 @@ fn main() {
                         process::exit(1);
                     });
 
+                    let mut failures = false;
+
                     for worktree in &worktrees {
                         if args.pull {
                             if let Some(warning) = worktree
-                                .forward_branch(args.rebase)
+                                .forward_branch(args.rebase, args.stash)
                                 .unwrap_or_else(|error| {
                                     print_error(&format!(
                                         "Error updating worktree branch: {}",
@@ -418,28 +440,29 @@ fn main() {
                                     process::exit(1);
                                 })
                             {
+                                failures = true;
                                 print_warning(&format!("{}: {}", worktree.name(), warning));
                             }
                         }
                     }
 
                     for worktree in &worktrees {
-                        if let Some(warning) =
-                            worktree
-                                .rebase_onto_default(&config)
-                                .unwrap_or_else(|error| {
-                                    print_error(&format!(
-                                        "Error rebasing worktree branch: {}",
-                                        error
-                                    ));
-                                    process::exit(1);
-                                })
+                        if let Some(warning) = worktree
+                            .rebase_onto_default(&config, args.stash)
+                            .unwrap_or_else(|error| {
+                                print_error(&format!("Error rebasing worktree branch: {}", error));
+                                process::exit(1);
+                            })
                         {
+                            failures = true;
                             print_warning(&format!("{}: {}", worktree.name(), warning));
                         } else {
                             print_success(&format!("{}: Done", worktree.name()));
                         }
                     }
+                    if failures {
+                        process::exit(1);
+                    }
                 }
             }
         }
diff --git a/src/repo.rs b/src/repo.rs
index 4e35698..f2cc015 100644
--- a/src/repo.rs
+++ b/src/repo.rs
@@ -181,17 +181,30 @@ impl Worktree {
         &self.name
     }
 
-    pub fn forward_branch(&self, rebase: bool) -> Result<Option<String>, String> {
+    pub fn forward_branch(&self, rebase: bool, stash: bool) -> Result<Option<String>, String> {
         let repo = Repo::open(Path::new(&self.name), false)
             .map_err(|error| format!("Error opening worktree: {}", error))?;
 
         if let Ok(remote_branch) = repo.find_local_branch(&self.name)?.upstream() {
             let status = repo.status(false)?;
+            let mut stashed_changes = false;
 
             if !status.clean() {
-                return Ok(Some(String::from("Worktree contains changes")));
+                if stash {
+                    repo.stash()?;
+                    stashed_changes = true;
+                } else {
+                    return Ok(Some(String::from("Worktree contains changes")));
+                }
             }
 
+            let unstash = || -> Result<(), String> {
+                if stashed_changes {
+                    repo.stash_pop()?;
+                }
+                Ok(())
+            };
+
             let remote_annotated_commit = repo
                 .0
                 .find_annotated_commit(remote_branch.commit()?.id().0)
@@ -231,6 +244,7 @@ impl Worktree {
                             continue;
                         }
                         rebase.abort().map_err(convert_libgit2_error)?;
+                        unstash()?;
                         return Err(convert_libgit2_error(error));
                     }
                 }
@@ -243,9 +257,11 @@ impl Worktree {
                     .map_err(convert_libgit2_error)?;
 
                 if analysis.is_up_to_date() {
+                    unstash()?;
                     return Ok(None);
                 }
                 if !analysis.is_fast_forward() {
+                    unstash()?;
                     return Ok(Some(String::from("Worktree cannot be fast forwarded")));
                 }
 
@@ -257,15 +273,18 @@ impl Worktree {
                     )
                     .map_err(convert_libgit2_error)?;
             }
+            unstash()?;
         } else {
             return Ok(Some(String::from("No remote branch to rebase onto")));
         };
+
         Ok(None)
     }
 
     pub fn rebase_onto_default(
         &self,
         config: &Option<WorktreeRootConfig>,
+        stash: bool,
     ) -> Result<Option<String>, String> {
         let repo = Repo::open(Path::new(&self.name), false)
             .map_err(|error| format!("Error opening worktree: {}", error))?;
@@ -291,6 +310,25 @@ impl Worktree {
             },
         };
 
+        let status = repo.status(false)?;
+        let mut stashed_changes = false;
+
+        if !status.clean() {
+            if stash {
+                repo.stash()?;
+                stashed_changes = true;
+            } else {
+                return Ok(Some(String::from("Worktree contains changes")));
+            }
+        }
+
+        let unstash = || -> Result<(), String> {
+            if stashed_changes {
+                repo.stash_pop()?;
+            }
+            Ok(())
+        };
+
         let base_branch = repo.find_local_branch(&default_branch_name)?;
         let base_annotated_commit = repo
             .0
@@ -330,11 +368,13 @@ impl Worktree {
                     continue;
                 }
                 rebase.abort().map_err(convert_libgit2_error)?;
+                unstash()?;
                 return Err(convert_libgit2_error(error));
             }
         }
 
         rebase.finish(None).map_err(convert_libgit2_error)?;
+        unstash()?;
         Ok(None)
     }
 }
@@ -456,6 +496,35 @@ impl Repo {
         }
     }
 
+    pub fn stash(&self) -> Result<(), String> {
+        let head_branch = self.head_branch()?;
+        let head = head_branch.commit()?;
+        let author = head.author();
+
+        // This is honestly quite horrible. The problem is that all stash operations expect a
+        // mutable reference (as they, well, mutate the repo after all). But we are heavily using
+        // immutable references a lot with this struct. I'm really not sure how to best solve this.
+        // Right now, we just open the repo AGAIN. It is safe, as we are only accessing the stash
+        // with the second reference, so there are no cross effects. But it just smells. Also,
+        // using `unwrap()` here as we are already sure that the repo is openable(?).
+        let mut repo = Repo::open(self.0.path(), false).unwrap();
+        repo.0
+            .stash_save2(&author, None, Some(git2::StashFlags::INCLUDE_UNTRACKED))
+            .map_err(convert_libgit2_error)?;
+        Ok(())
+    }
+
+    pub fn stash_pop(&self) -> Result<(), String> {
+        let mut repo = Repo::open(self.0.path(), false).unwrap();
+        repo.0
+            .stash_pop(
+                0,
+                Some(git2::StashApplyOptions::new().reinstantiate_index()),
+            )
+            .map_err(convert_libgit2_error)?;
+        Ok(())
+    }
+
     pub fn rename_remote(&self, remote: &RemoteHandle, new_name: &str) -> Result<(), String> {
         let failed_refspecs = self
             .0
@@ -1253,6 +1322,10 @@ impl Commit<'_> {
     pub fn id(&self) -> Oid {
         Oid(self.0.id())
     }
+
+    pub(self) fn author(&self) -> git2::Signature {
+        self.0.author()
+    }
 }
 
 impl<'a> Branch<'a> {
@@ -1323,9 +1396,7 @@ fn get_remote_callbacks() -> git2::RemoteCallbacks<'static> {
             Some(username) => username,
             None => panic!("Could not get username. This is a bug"),
         };
-        git2::Cred::ssh_key_from_agent(username).or_else(|_| {
-            git2::Cred::ssh_key(username, None, &crate::env_home().join(".ssh/id_rsa"), None)
-        })
+        git2::Cred::ssh_key_from_agent(username)
     });
 
     callbacks