diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2eee3f6..f3de010 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -40,5 +40,7 @@ jobs:
           readlink result
           nix build .#generated
           readlink result
+          nix build .#cargoNix.workspaceMembers.challenges.build
+          readlink result
       - run: nix build
       - run: readlink result
diff --git a/flake.nix b/flake.nix
index 89572c1..ed01da6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -56,7 +56,7 @@
         });
       };
     in {
-      inherit src generated;
+      inherit src generated cargoNix;
       default = self.packages.${system}.challenges;
       challenges = pkgs.symlinkJoin {
         name = "academy-challenges";