diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ed26745..9b4e788 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,12 +11,12 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v2.4.0
-    - uses: cachix/install-nix-action@v15
-      with:
-        extra_nix_config: |
-          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
-    - name: Build
-      run: nix build .#crystal2nix
-    - name: Run tests
-      run: nix flake check
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v27
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Build
+        run: nix build .#crystal2nix
+      - name: Run tests
+        run: nix flake check