diff --git a/.github/workflows/nix_tests.yaml b/.github/workflows/nix_tests.yaml
index a44a55ad..e0bbfbf3 100644
--- a/.github/workflows/nix_tests.yaml
+++ b/.github/workflows/nix_tests.yaml
@@ -20,6 +20,9 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v27
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+        install-url: https://releases.nixos.org/nix/nix-2.18.5/install
     - uses: cachix/cachix-action@v14
       with:
         name: text-generation-inference