diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a8711d1..4e1139a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,6 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: cachix/install-nix-action@v15
       - name: Run tests
         run: nix develop -c python -mpytest -vv -s
   nix-flake: