diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1dcec32..661a483 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -31,7 +31,7 @@ jobs:
         fetch-depth: 0
 
     # Install Nix and use that to run our tests so our environment matches exactly.
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixos-unstable
 
@@ -56,7 +56,7 @@ jobs:
         fetch-depth: 0
 
     # Install Nix and use that to run our tests so our environment matches exactly.
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         nix_path: nixpkgs=channel:nixos-unstable