diff --git a/.github/workflows/md-links.yml b/.github/workflows/md-links.yml
index e5c1e7a2..b4f2de13 100644
--- a/.github/workflows/md-links.yml
+++ b/.github/workflows/md-links.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - name: markdown-link-check
         uses: gaurav-nelson/github-action-markdown-link-check@1.0.15
         with: