diff --git a/.github/workflows/sync-langs.yml b/.github/workflows/sync-langs.yml
index 5b1162a..98bd0aa 100644
--- a/.github/workflows/sync-langs.yml
+++ b/.github/workflows/sync-langs.yml
@@ -9,7 +9,7 @@ jobs:
   sync:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Sync language features
         run: python scripts/sync-langs.py