diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1d3a2e5..7529c9f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,4 +17,4 @@ jobs:
             trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
             substituters = https://cache.iog.io https://cache.nixos.org/
     # - name: Build and test in Nix devshell
-    - run: nix develop --command bash -c "sbt test"
+    - run: nix develop .#ci --command bash -c "sbt test"