diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 04fb87c..05ea48a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,5 +15,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: cachix/install-nix-action@v9
+      - uses: cachix/install-nix-action@v12
+        with:
+          nix_path: nixpkgs=channel:nixos-20.09
       - run: ./test.sh