diff --git a/.github/workflows/bumpversion.yml b/.github/workflows/bumpversion.yml
index f4068daf5..aab3b0ab4 100644
--- a/.github/workflows/bumpversion.yml
+++ b/.github/workflows/bumpversion.yml
@@ -20,7 +20,7 @@ jobs:
           app-id: ${{ vars.APP_ID }}
           private-key: ${{ secrets.PRIVATE_KEY }}
       - name: Check out
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           token: ${{ steps.app-token.outputs.token }}
           fetch-depth: 0
diff --git a/.github/workflows/docspublish.yml b/.github/workflows/docspublish.yml
index c572d2d3f..76cfc5975 100644
--- a/.github/workflows/docspublish.yml
+++ b/.github/workflows/docspublish.yml
@@ -11,7 +11,7 @@ jobs:
     if: ${{ github.repository == 'commitizen-tools/commitizen' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
           fetch-depth: 0
@@ -25,7 +25,9 @@ jobs:
         run: |
           sudo apt update
           sudo apt install -y ffmpeg ttyd
-          go install github.com/charmbracelet/vhs@latest
+          # Pin VHS to a known version so gif rendering is deterministic across runs.
+          # Bump this version intentionally when you want to refresh all interactive screenshots.
+          go install github.com/charmbracelet/vhs@v0.11.0
       - name: Install dependencies
         run: |
           uv --version
@@ -33,6 +35,33 @@ jobs:
       - name: Update CLI screenshots
         run: |
           uv run --no-sync poe doc:screenshots
+      - name: Discard cli_interactive regeneration when render inputs are unchanged
+        # VHS gif output drifts by a few bytes between runs even when sources are
+        # identical, which used to produce a noisy stream of `docs(cli/screenshots)`
+        # commits. Keep regenerated gifs only when something that can actually
+        # change the rendered content has changed in this push (the tape sources,
+        # or any commitizen source code the tapes execute), or when manually
+        # dispatched.
+        run: |
+          if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
+            echo "Manual run; keeping any regenerated cli_interactive gifs."
+            exit 0
+          fi
+          before="${{ github.event.before }}"
+          if [[ -z "$before" || "$before" == "0000000000000000000000000000000000000000" ]]; then
+            echo "No previous SHA available (first push or new branch); keeping any regenerated cli_interactive gifs."
+            exit 0
+          fi
+          if ! git rev-parse --verify "$before^{commit}" >/dev/null 2>&1; then
+            echo "Previous SHA $before is unreachable; keeping any regenerated cli_interactive gifs."
+            exit 0
+          fi
+          if git diff --quiet "$before" HEAD -- docs/images/'*.tape' docs/images/shared/ commitizen/; then
+            echo "Tape sources and commitizen/ unchanged since $before; discarding cli_interactive gif regeneration to avoid byte-level churn."
+            git checkout -- docs/images/cli_interactive/
+          else
+            echo "Render inputs changed since $before (tapes or commitizen/); keeping regenerated cli_interactive gifs."
+          fi
       - name: Commit and push updated CLI screenshots
         run: |
           git config --global user.name "github-actions[bot]"
@@ -52,7 +81,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: update-cli-screenshots
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           token: "${{ secrets.PERSONAL_ACCESS_TOKEN }}"
           fetch-depth: 0
diff --git a/.github/workflows/homebrewpublish.yml b/.github/workflows/homebrewpublish.yml
index 3a4d2cd3d..476a8c40e 100644
--- a/.github/workflows/homebrewpublish.yml
+++ b/.github/workflows/homebrewpublish.yml
@@ -12,7 +12,7 @@ jobs:
     if: ${{ github.repository == 'commitizen-tools/commitizen' && github.event.workflow_run.conclusion == 'success' }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Set up Python
         uses: astral-sh/setup-uv@v7
       - name: Install dependencies
diff --git a/.github/workflows/label_pr.yml b/.github/workflows/label_pr.yml
index 168b322ff..f01afa765 100644
--- a/.github/workflows/label_pr.yml
+++ b/.github/workflows/label_pr.yml
@@ -9,7 +9,7 @@ jobs:
       pull-requests: write
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
       with:
         sparse-checkout: |
           .github/labeler.yml
diff --git a/.github/workflows/links.yml b/.github/workflows/links.yml
index 28345c464..b541439f0 100644
--- a/.github/workflows/links.yml
+++ b/.github/workflows/links.yml
@@ -13,7 +13,7 @@ jobs:
     permissions:
       issues: write # required for Broken Links Report
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Link Checker
         id: lychee
diff --git a/.github/workflows/pr-bump-preview.yml b/.github/workflows/pr-bump-preview.yml
index 1eab96774..9ed2a335d 100644
--- a/.github/workflows/pr-bump-preview.yml
+++ b/.github/workflows/pr-bump-preview.yml
@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out PR head
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
@@ -84,11 +84,27 @@ jobs:
             esac
           } > comment.md
 
+      # Look up an existing preview comment so the next step edits it in
+      # place instead of appending a new one on every run.
+      # `peter-evans/create-or-update-comment` does not search by body
+      # itself -- it only creates new comments, or updates a specific
+      # `comment-id`.
+      - name: Find existing preview comment
+        id: find-comment
+        uses: peter-evans/find-comment@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: "github-actions[bot]"
+          body-includes: "<!-- commitizen-bump-preview -->"
+
       - name: Post or update PR comment
         uses: peter-evans/create-or-update-comment@v5
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          # When empty (no prior comment found) a new one is created;
+          # otherwise the existing comment is edited in place.
+          comment-id: ${{ steps.find-comment.outputs.comment-id }}
           issue-number: ${{ github.event.pull_request.number }}
           body-path: comment.md
-          body-includes: "<!-- commitizen-bump-preview -->"
           edit-mode: replace
diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 0667e255c..5b01beb8e 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -13,7 +13,7 @@ jobs:
     outputs:
       relevant: ${{ steps.filter.outputs.relevant }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
       - id: filter
@@ -36,7 +36,7 @@ jobs:
         if: ${{ needs.detect_changes.outputs.relevant != 'true' }}
         run: |
           echo "No relevant file changes; skipping tests and linters."
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         if: ${{ needs.detect_changes.outputs.relevant == 'true' }}
         with:
           fetch-depth: 0
@@ -58,12 +58,12 @@ jobs:
           uv run --no-sync poe ci
         shell: bash
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v6
+        uses: codecov/codecov-action@v7
         if: ${{ needs.detect_changes.outputs.relevant == 'true' }}
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
       - name: Upload test results to Codecov
-        uses: codecov/codecov-action@v6
+        uses: codecov/codecov-action@v7
         if: ${{ needs.detect_changes.outputs.relevant == 'true' && !cancelled() }}
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.github/workflows/pythonpublish.yml b/.github/workflows/pythonpublish.yml
index 238bc4db4..0903f11f4 100644
--- a/.github/workflows/pythonpublish.yml
+++ b/.github/workflows/pythonpublish.yml
@@ -32,7 +32,7 @@ jobs:
             echo "::error::Dispatch ref '${TAG}' is not an existing tag"
             exit 1
           fi
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
           ref: ${{ github.event_name == 'workflow_dispatch' && format('refs/tags/{0}', github.event.inputs.ref) || github.ref }}
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7c9d1086f..7b9f6ee05 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -56,7 +56,7 @@ repos:
           - tomli
 
   - repo: https://github.com/commitizen-tools/commitizen
-    rev: v4.16.3 # automatically updated by Commitizen
+    rev: v4.16.4 # automatically updated by Commitizen
     hooks:
       - id: commitizen
       - id: commitizen-branch
diff --git a/commitizen/__version__.py b/commitizen/__version__.py
index b2da05759..d3c4e81b6 100644
--- a/commitizen/__version__.py
+++ b/commitizen/__version__.py
@@ -1 +1 @@
-__version__ = "4.16.3"
+__version__ = "4.16.4"
diff --git a/commitizen/providers/cargo_provider.py b/commitizen/providers/cargo_provider.py
index 235d4a110..5152bc74c 100644
--- a/commitizen/providers/cargo_provider.py
+++ b/commitizen/providers/cargo_provider.py
@@ -82,15 +82,15 @@ def set_lock_version(self, version: str) -> None:
                     ).get("package", {})
                     if TYPE_CHECKING:
                         assert isinstance(package_content, dict)
-                    try:
-                        version_workspace = package_content["version"]["workspace"]
-                        if version_workspace is True:
-                            package_name = package_content["name"]
-                            if TYPE_CHECKING:
-                                assert isinstance(package_name, str)
-                            members_inheriting.append(package_name)
-                    except NonExistentKey:
-                        pass
+                    version_field = package_content.get("version")
+                    if (
+                        isinstance(version_field, dict)
+                        and version_field.get("workspace") is True
+                    ):
+                        package_name = package_content["name"]
+                        if TYPE_CHECKING:
+                            assert isinstance(package_name, str)
+                        members_inheriting.append(package_name)
 
             for i, package in enumerate(packages):
                 if package["name"] in members_inheriting:
diff --git a/docs/images/bump.tape b/docs/images/bump.tape
index ef4a427c9..03b81fdb7 100644
--- a/docs/images/bump.tape
+++ b/docs/images/bump.tape
@@ -57,12 +57,17 @@ Type "cz bump"
 Sleep 500ms
 Enter
 
-# Wait for the "Is this the first tag created?" prompt
-Sleep 2s
+# Wait for the "Is this the first tag created?" prompt to render
+Wait+Screen /Is this the first tag/
+
+# Small visual pause so the prompt is readable before the answer
+Sleep 500ms
 
 # Answer Yes to "Is this the first tag created?" (default is Yes, just press Enter)
 Enter
-Sleep 3s
+
+# Wait for cz bump to finish (the "Done!" success line is printed last)
+Wait+Screen /Done!/
 
 # Step 3: Show new version after bump
 Type "cz version --project"
diff --git a/docs/images/cli_interactive/bump.gif b/docs/images/cli_interactive/bump.gif
index fdf09310d..3d482720f 100644
Binary files a/docs/images/cli_interactive/bump.gif and b/docs/images/cli_interactive/bump.gif differ
diff --git a/docs/images/cli_interactive/commit.gif b/docs/images/cli_interactive/commit.gif
index 35392de01..b50bbfdeb 100644
Binary files a/docs/images/cli_interactive/commit.gif and b/docs/images/cli_interactive/commit.gif differ
diff --git a/docs/images/cli_interactive/init.gif b/docs/images/cli_interactive/init.gif
index 96504321b..faa852940 100644
Binary files a/docs/images/cli_interactive/init.gif and b/docs/images/cli_interactive/init.gif differ
diff --git a/docs/images/cli_interactive/shortcut_custom.gif b/docs/images/cli_interactive/shortcut_custom.gif
index 69562f396..27e9587e2 100644
Binary files a/docs/images/cli_interactive/shortcut_custom.gif and b/docs/images/cli_interactive/shortcut_custom.gif differ
diff --git a/docs/images/cli_interactive/shortcut_default.gif b/docs/images/cli_interactive/shortcut_default.gif
index 359943130..9f54b17e7 100644
Binary files a/docs/images/cli_interactive/shortcut_default.gif and b/docs/images/cli_interactive/shortcut_default.gif differ
diff --git a/docs/images/commit.tape b/docs/images/commit.tape
index e93a38ae6..e60b27ae3 100644
--- a/docs/images/commit.tape
+++ b/docs/images/commit.tape
@@ -29,38 +29,41 @@ Type "cz commit"
 Sleep 500ms
 Enter
 
-# Wait for first prompt to appear
-Sleep 1s
-
-# Question 1: Select the type of change (move down to "feat")
+# Q1: prefix -- select the type of change (move down to "feat")
+Wait+Screen /Select the type of change/
+Sleep 500ms
 Down
 Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 2: Scope (optional, skip)
+# Q2: scope (optional, skip)
+Wait+Screen /What is the scope/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 3: Subject
+# Q3: subject
+Wait+Screen /imperative summary/
+Sleep 500ms
 Type "awesome new feature"
 Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 4: Is this a BREAKING CHANGE? (No)
+# Q4: body (optional, skip)
+Wait+Screen /additional contextual information/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 5: Body (optional, skip)
+# Q5: is_breaking_change (No)
+Wait+Screen /BREAKING CHANGE\?/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 6: Footer (optional, skip)
+# Q6: footer (optional, skip)
+Wait+Screen /Footer\. Information/
+Sleep 500ms
 Enter
-Sleep 1s
 
 # Wait for commit success message
-Sleep 1s
+Sleep 2s
 
 Source shared/cleanup.tape
diff --git a/docs/images/init.tape b/docs/images/init.tape
index aad833530..6edbb9e6e 100644
--- a/docs/images/init.tape
+++ b/docs/images/init.tape
@@ -15,51 +15,55 @@ Type "cz init"
 Sleep 500ms
 Enter
 
-# Wait for welcome message and first prompt
-Sleep 500ms
-Sleep 1s
-
-# Question 1: Please choose a supported config file
+# Q1: Please choose a supported config file
 # Default is .cz.toml, just press Enter
+Wait+Screen /Please choose a supported config/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 2: Please choose a cz (commit rule)
+# Q2: Please choose a cz (commit rule)
 # Default is cz_conventional_commits, just press Enter
+Wait+Screen /Please choose a cz/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 3: Choose the source of the version
-# Default is "commitizen: Fetch and set version in commitizen config, just press Enter"
+# Q3: Choose the source of the version
+# Default is "commitizen", just press Enter
+Wait+Screen /Choose the source of the version/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 4: Choose version scheme
+# Q4: Choose version scheme
 # Default is semver, just press Enter
+Wait+Screen /Choose version scheme/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 5: Please enter the correct version format
+# Q5: Please enter the correct version format
 # Default is "$version", just press Enter
+Wait+Screen /Please enter the correct version format/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 6: Create changelog automatically on bump
+# Q6: Create changelog automatically on bump
 # Default is Yes, just press Enter
+Wait+Screen /Create changelog automatically on bump/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 7: Keep major version zero (0.x) during breaking changes
+# Q7: Keep major version zero (0.x) during breaking changes
 # Default is Yes, just press Enter
+Wait+Screen /Keep major version zero/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 8: What types of pre-commit hook you want to install?
-# Default is [commit-msg], just press Enter to accept
+# Q8: What types of pre-commit hook you want to install?
+# Default is [], just press Enter to accept
+Wait+Screen /types of pre-commit hook/
+Sleep 500ms
 Enter
-Sleep 1s
 
 # Wait for completion message
-Sleep 1s
+Sleep 2s
 
 Source shared/cleanup.tape
diff --git a/docs/images/shortcut_custom.tape b/docs/images/shortcut_custom.tape
index 54362b4bb..710ebbec7 100644
--- a/docs/images/shortcut_custom.tape
+++ b/docs/images/shortcut_custom.tape
@@ -83,23 +83,21 @@ Type "cz commit"
 Sleep 500ms
 Enter
 
-# Wait for first prompt to appear
-Sleep 2s
-
-# Question 1: Select the type of change (press d to "docs")
+# Q1: prefix -- press "d" shortcut for "docs"
+Wait+Screen /Select the type of change/
 Sleep 1s
 Type "d"
 Sleep 2s
 Enter
-Sleep 1s
 
-# Question 2: Commit body
+# Q2: Commit body
+Wait+Screen /Commit body/
+Sleep 500ms
 Type "demo with custom keys"
 Sleep 500ms
 Enter
-Sleep 500ms
 
 # Wait for commit success message
-Sleep 1s
+Sleep 2s
 
 Source shared/cleanup.tape
diff --git a/docs/images/shortcut_default.tape b/docs/images/shortcut_default.tape
index c7d12111c..244f66e5b 100644
--- a/docs/images/shortcut_default.tape
+++ b/docs/images/shortcut_default.tape
@@ -42,39 +42,41 @@ Type "cz commit"
 Sleep 500ms
 Enter
 
-# Wait for first prompt to appear
-Sleep 2s
-
-# Question 1: Select the type of change (press d to "docs")
+# Q1: prefix -- press "d" shortcut for "docs"
+Wait+Screen /Select the type of change/
 Sleep 1s
 Type "d"
 Sleep 2s
 Enter
-Sleep 1s
 
-# Question 2: Scope (optional, skip)
+# Q2: scope (optional, skip)
+Wait+Screen /What is the scope/
+Sleep 500ms
 Enter
-Sleep 1s
 
-# Question 3: Subject
+# Q3: subject
+Wait+Screen /imperative summary/
+Sleep 500ms
 Type "demo with custom keys"
 Sleep 500ms
 Enter
-Sleep 500ms
 
-# Question 4: Is this a BREAKING CHANGE? (No)
-Enter
+# Q4: body (optional, skip)
+Wait+Screen /additional contextual information/
 Sleep 500ms
-
-# Question 5: Body (optional, skip)
 Enter
-Sleep 500ms
 
-# Question 6: Footer (optional, skip)
+# Q5: is_breaking_change (No)
+Wait+Screen /BREAKING CHANGE\?/
+Sleep 500ms
 Enter
+
+# Q6: footer (optional, skip)
+Wait+Screen /Footer\. Information/
 Sleep 500ms
+Enter
 
 # Wait for commit success message
-Sleep 1s
+Sleep 2s
 
 Source shared/cleanup.tape
diff --git a/docs/tutorials/github_actions.md b/docs/tutorials/github_actions.md
index 7717bdbf5..f0b216072 100644
--- a/docs/tutorials/github_actions.md
+++ b/docs/tutorials/github_actions.md
@@ -205,12 +205,20 @@ jobs:
                 ;;
             esac
           } > comment.md
-      - uses: peter-evans/create-or-update-comment@v4
+      - name: Find existing preview comment
+        id: find-comment
+        uses: peter-evans/find-comment@v3
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           issue-number: ${{ github.event.pull_request.number }}
-          body-path: comment.md
+          comment-author: "github-actions[bot]"
           body-includes: "<!-- commitizen-bump-preview -->"
+      - uses: peter-evans/create-or-update-comment@v5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          comment-id: ${{ steps.find-comment.outputs.comment-id }}
+          issue-number: ${{ github.event.pull_request.number }}
+          body-path: comment.md
           edit-mode: replace
 ```
 
@@ -235,10 +243,13 @@ jobs:
   `update_changelog_on_bump` is set in your config, also the changelog
   entries that would be produced). Exit code `21` (`NoneIncrementExit`)
   is treated as "no eligible bump" rather than a failure.
-- **Sticky comment**: The hidden HTML marker `<!-- commitizen-bump-preview -->`
-  lets [`peter-evans/create-or-update-comment`](https://github.com/peter-evans/create-or-update-comment)
-  find and replace the previous preview on every push, instead of leaving a
-  growing trail of comments.
+- **Sticky comment**: [`peter-evans/find-comment`](https://github.com/peter-evans/find-comment)
+  looks up an existing comment by the hidden HTML marker
+  `<!-- commitizen-bump-preview -->` and bot author, then
+  [`peter-evans/create-or-update-comment`](https://github.com/peter-evans/create-or-update-comment)
+  edits it in place (or creates a new one on the first run when the
+  marker is not yet present), instead of leaving a growing trail of
+  comments.
 
 [jinja]: https://github.com/commitizen-tools/commitizen/blob/master/commitizen/changelog.py
 
diff --git a/pyproject.toml b/pyproject.toml
index 3fcb69437..37c1ac045 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "commitizen"
-version = "4.16.3"
+version = "4.16.4"
 description = "Python commitizen client tool"
 authors = [{ name = "Santiago Fraire", email = "santiwilly@gmail.com" }]
 maintainers = [
diff --git a/tests/providers/test_cargo_provider.py b/tests/providers/test_cargo_provider.py
index 63f143b29..023e34b21 100644
--- a/tests/providers/test_cargo_provider.py
+++ b/tests/providers/test_cargo_provider.py
@@ -451,3 +451,80 @@ def test_cargo_provider_workspace_member_without_workspace_key(
     assert file.read_text() == dedent(expected_workspace_toml)
     # The lock file should remain unchanged since the member doesn't inherit workspace version
     assert lock_file.read_text() == dedent(expected_lock_content)
+
+
+def test_cargo_provider_workspace_member_with_fixed_version(
+    config: BaseConfig,
+    chdir: Path,
+):
+    """Regression test for https://github.com/commitizen-tools/commitizen/issues/2001.
+
+    A workspace member with a hardcoded ``version = "x.y.z"`` string (rather
+    than ``version.workspace = true``) used to crash ``set_lock_version`` with
+    ``TypeError: string indices must be integers, not 'str'`` because the code
+    unconditionally subscripted ``package["version"]["workspace"]``.
+    """
+    workspace_toml = """\
+[workspace]
+members = ["member_with_fixed_version"]
+
+[workspace.package]
+version = "0.1.0"
+"""
+
+    # Real Cargo syntax for a workspace member that opts out of the
+    # workspace-inherited version by pinning its own.
+    member_content = """\
+[package]
+name = "member_with_fixed_version"
+version = "0.9.0"
+"""
+
+    lock_content = """\
+[[package]]
+name = "member_with_fixed_version"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "123abc"
+"""
+
+    expected_workspace_toml = """\
+[workspace]
+members = ["member_with_fixed_version"]
+
+[workspace.package]
+version = "42.1"
+"""
+
+    # The pinned member must not be bumped because it does not inherit the
+    # workspace version.
+    expected_lock_content = """\
+[[package]]
+name = "member_with_fixed_version"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "123abc"
+"""
+
+    filename = CargoProvider.filename
+    file = chdir / filename
+    file.write_text(dedent(workspace_toml))
+
+    os.mkdir(chdir / "member_with_fixed_version")
+    member_file = chdir / "member_with_fixed_version" / "Cargo.toml"
+    member_file.write_text(dedent(member_content))
+
+    lock_filename = CargoProvider.lock_filename
+    lock_file = chdir / lock_filename
+    lock_file.write_text(dedent(lock_content))
+
+    config.settings["version_provider"] = "cargo"
+
+    provider = get_provider(config)
+    assert isinstance(provider, CargoProvider)
+    assert provider.get_version() == "0.1.0"
+
+    # Must not raise TypeError: string indices must be integers, not 'str'.
+    provider.set_version("42.1")
+    assert file.read_text() == dedent(expected_workspace_toml)
+    assert lock_file.read_text() == dedent(expected_lock_content)
diff --git a/uv.lock b/uv.lock
index e07a6fb8b..4f67292ce 100644
--- a/uv.lock
+++ b/uv.lock
@@ -216,7 +216,7 @@ wheels = [
 
 [[package]]
 name = "commitizen"
-version = "4.16.3"
+version = "4.16.4"
 source = { editable = "." }
 dependencies = [
     { name = "argcomplete" },