diff --git a/.github/workflows/ci-markdown-link.yml b/.github/workflows/ci-markdown-link.yml
index 1ff8045e0..b0d5d0deb 100644
--- a/.github/workflows/ci-markdown-link.yml
+++ b/.github/workflows/ci-markdown-link.yml
@@ -19,7 +19,7 @@ jobs:
 
       # equivalent cli: linkspector check
       - name: Run linkspector
-        uses: umbrelladocs/action-linkspector@v1
+        uses: umbrelladocs/action-linkspector@652f85bc57bb1e7d4327260decc10aa68f7694c3 # v1.4.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           reporter: github-pr-review