diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e41bd76..288d6e5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -35,9 +35,9 @@ jobs:
     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@v15
+      uses: cachix/install-nix-action@v14.1
       with:
         nix_path: "${{ matrix.nixPath }}"
         extra_nix_config: |