diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d4ff360..ff0143b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@
     runs-on: ubuntu-latest
     steps:
       - name: Checkout master
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@1e204e9a9253d643386038d443f96446fa156a97 #2.3.5
         with:
           fetch-depth: 0