diff --git a/.github/workflows/prettier.yml b/.github/workflows/prettier.yml
index 677f010..5cf742e 100644
--- a/.github/workflows/prettier.yml
+++ b/.github/workflows/prettier.yml
@@ -16,7 +16,7 @@ jobs:
               uses: actions/checkout@v3
 
             - name: Install the Nix package manager
-              uses: cachix/install-nix-action@v20
+              uses: cachix/install-nix-action@6a9a9e84a173d90b3ffb42c5ddaf9ea033fad011 # v23
 
             - name: Checks
               run: nix run nixpkgs#nodePackages.prettier -- --check .