diff --git a/.github/workflows/lockfiles.yaml b/.github/workflows/lockfiles.yaml
new file mode 100644
index 00000000..f8e57f25
--- /dev/null
+++ b/.github/workflows/lockfiles.yaml
@@ -0,0 +1,19 @@
+name: Check .lock files
+on:
+    pull_request: null
+    push:
+        branches:
+            - master
+jobs:
+    lockfiles:
+        runs-on: ubuntu-latest
+        name: Verify lock file integrity
+        if: ${{ github.actor != 'kevinpapst' && github.actor != 'dependabot[bot]' }}
+        steps:
+            - name: Clone Kimai
+              uses: actions/checkout@v2
+            - name: Prevent file change
+              uses: xalvarez/prevent-file-change-action@v1
+              with:
+                  githubToken: ${{ secrets.GITHUB_TOKEN }}
+                  pattern: .*.lock