diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 72f0068..d44d8e4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,5 +14,5 @@ jobs:
     if: github.repository_owner == 'nix-community'
     steps:
     - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
     - run: nix build --extra-experimental-features nix-command -L -f . -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz --show-trace