diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ce25a3c..e5c222a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -35,7 +35,7 @@ jobs:
           - 29.1
           - snapshot
     steps:
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - uses: purcell/setup-emacs@master