diff --git a/.github/workflows/test-flakes.yml b/.github/workflows/test-flakes.yml
deleted file mode 100644
index d4da47a..0000000
--- a/.github/workflows/test-flakes.yml
+++ /dev/null
@@ -1,30 +0,0 @@
-name: "Flake test"
-on:
-  pull_request:
-  schedule:
-    - cron:  '51 2 * * *'
-jobs:
-  tests:
-    strategy:
-      matrix:
-        os: [ ubuntu-latest, macos-latest ]
-    runs-on: ${{ matrix.os }}
-    steps:
-    - uses: actions/checkout@v2
-      with:
-          # Nix Flakes doesn't work on shallow clones
-          fetch-depth: 0
-    - uses: cachix/install-nix-action@v14
-      with:
-        extra_nix_config: |
-          experimental-features = nix-command flakes
-          system-features = nixos-test benchmark big-parallel kvm
-    - name: Setup cachix
-      uses: cachix/cachix-action@v10
-      with:
-        name: mic92
-        signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
-    - name: List flake structure
-      run: nix flake show
-    - name: Run flake check (flake)
-      run: nix flake check -L
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 05ad242..ad6c209 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,10 +14,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v14
+    - uses: cachix/install-nix-action@v15
       with:
         nix_path: "${{ matrix.nixPath }}"
-        extra_nix_config: "system-features = nixos-test benchmark big-parallel kvm"
     - name: Setup cachix
       uses: cachix/cachix-action@v10
       with:
@@ -29,6 +28,11 @@ jobs:
     - name: Run lint
       run: nix-build --no-out-link default.nix -A lint
       if: matrix.os == 'ubuntu-latest'
+    - name: List flake structure
+      run: nix flake show
+    - name: Run flake check (flake)
+      run: nix flake check -L
+    # this should be the same as `nix flake check`
     - name: Build nix packages
       run: nix-build --no-out-link release.nix
     - name: Run unit tests