diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5d553a..0109e36 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project (post v2.1.0) adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+### Fixed
+- `slang`, `gitlab-ci`: Pass `--no-project` to `uv run` so the calling repository's `pyproject.toml` is no longer discovered and synced before running the action's scripts.
 
 ## 2.5.1 - 2026-06-09
 ### Added
diff --git a/gitlab-ci/action.yml b/gitlab-ci/action.yml
index 27513a7..6d6c431 100644
--- a/gitlab-ci/action.yml
+++ b/gitlab-ci/action.yml
@@ -63,4 +63,4 @@ runs:
       run: |
         export SHA=${{ github.sha }}
         if [ "$GITHUB_EVENT_NAME" == "pull_request" ]; then export SHA=${{ github.event.pull_request.head.sha }}; fi
-        uv run --with requests ${{ github.action_path }}/gitlab-ci.py $SHA ${{ inputs.token }} ${{ inputs.domain }} ${{ inputs.repo }} ${{ inputs.api-version }} ${{ inputs.retry-count }} ${{ inputs.retry-period }} ${{ inputs.poll-count }} ${{ inputs.poll-period }}
+        uv run --no-project --with requests ${{ github.action_path }}/gitlab-ci.py $SHA ${{ inputs.token }} ${{ inputs.domain }} ${{ inputs.repo }} ${{ inputs.api-version }} ${{ inputs.retry-count }} ${{ inputs.retry-period }} ${{ inputs.poll-count }} ${{ inputs.poll-period }}
diff --git a/slang/action.yml b/slang/action.yml
index c16812a..bfcd668 100644
--- a/slang/action.yml
+++ b/slang/action.yml
@@ -45,7 +45,7 @@ runs:
 
       - name: Run slang
         shell: bash
-        run: uv run --with "pyslang==${{ inputs.pyslang-version }}" ${{ github.action_path }}/run_slang.py "${{ inputs.slang-flags }}" slang_diags.json
+        run: uv run --no-project --with "pyslang==${{ inputs.pyslang-version }}" ${{ github.action_path }}/run_slang.py "${{ inputs.slang-flags }}" slang_diags.json
 
       - name: Setup reviewdog
         uses: reviewdog/action-setup@v1
@@ -58,7 +58,7 @@ runs:
         env:
           REVIEWDOG_GITHUB_API_TOKEN: ${{ inputs.token }}
         run: |
-          uv run ${{ github.action_path }}/slang_to_rdjson.py slang_diags.json \
+          uv run --no-project ${{ github.action_path }}/slang_to_rdjson.py slang_diags.json \
             | reviewdog -f=rdjson \
                 -name=${{ inputs.reviewdog-name }} \
                 -reporter=${{ inputs.reviewdog-reporter }} \