diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 0c18e46..cbf62ba 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -31,7 +31,7 @@ jobs:
           version: stable
 
       - name: Install Lua
-        uses: leafo/gh-actions-lua@v13
+        uses: leafo/gh-actions-lua@6919171ccf181b826f44b9bca76307b577217377 # v13
         with:
           luaVersion: "5.1"