diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 598eb62a..f1604ce6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -43,7 +43,7 @@ jobs:
         shell: bash
 
       - name: Checkout the "hidden" branch
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.0
         with:
           ref: hidden