diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3efc7ed..c7e0b5e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2.4.0
-    - uses: cachix/install-nix-action@v16
+    - uses: cachix/install-nix-action@v20
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - uses: cachix/cachix-action@v12