diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0ebcc34b67d2c9dcfaa4892c4e271d89eca1d745..c0c72015a2aa4e423b6c7e1093e3584f8afdc793 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -40,7 +40,7 @@           - nixpkgs=channel:nixos-21.05
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v2.3.5
     - name: Install nix
       uses: cachix/install-nix-action@v14
       with: