diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7b1fdbf7..36525740 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
     - uses: actions/checkout@v2
     - uses: cachix/install-nix-action@v16
       with:
-        nix_path: nixpkgs=channel:nixos-unstable
+        nix_path: nixpkgs=channel:nixos-21.11
     - uses: cachix/cachix-action@v10
       with:
         name: nix-community