diff --git a/.github/workflows/cachix.yaml b/.github/workflows/cachix.yaml
index c14e1ea..87aad8c 100644
--- a/.github/workflows/cachix.yaml
+++ b/.github/workflows/cachix.yaml
@@ -15,10 +15,10 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: cachix/install-nix-action@v25
+    - uses: cachix/install-nix-action@v27
 
     - name: Run alejandra
-      run: nix run nixpkgs#alejandra -- --check .
+      run: nix develop --command alejandra --check .
 
   flake-check:
     name: Flake check