diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a4c67c45..df3c3f7e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,6 +19,8 @@ jobs:
     steps:
       - uses: "actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f"
       - uses: "cachix/install-nix-action@07da2520eebede906fbeefa9dd0a2b635323909d"
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
       - name: "Instantiation"
         run: |
           nix-env --out-path -qaP --no-name -f .ci/instantiate-all.nix \