diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d8a485b..a9b95cb 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4.1.6
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - run: nix flake check
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index d6598ee..2d8d975 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4.1.6
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       - run: ./update