diff --git a/.github/workflows/links.yaml b/.github/workflows/links.yaml
index f1f58fd..c2e622c 100644
--- a/.github/workflows/links.yaml
+++ b/.github/workflows/links.yaml
@@ -14,7 +14,7 @@ jobs:
     timeout-minutes: 2
     steps:
       - name: Checkout source
-        uses: actions/checkout@v4
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4
 
       - name: Check links
         uses: paddyroddy/.github/actions/links@v0