diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d3ed7c3..ec9ca7f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -79,9 +79,10 @@ jobs:
     - uses: DeterminateSystems/magic-nix-cache-action@main
     - run: cat /etc/nix/nix.conf
     - run: cat ~/.config/nix/nix.conf
-    - run: nix flake check --no-build --verbose
+    - run: nix registry add shajra-private github:shajra/empty
+    - run: nix flake lock --update-input shajra-private
     # DESIGN: Can't CI homes; even slimmed they're too big for GitHub
-    - run: nix run .#nixosConfigurations.cake.nixos-rebuild -- --flake .#cake-slim build
+    - run: nix run .#nixosConfigurations.cake-slim.nixos-rebuild -- --flake .#cake-slim build
   installers-darwin:
     needs: [pkgs-darwin]
     runs-on: macos-latest
@@ -101,6 +102,7 @@ jobs:
     - uses: DeterminateSystems/magic-nix-cache-action@main
     - run: cat /etc/nix/nix.conf
     - run: cat ~/.config/nix/nix.conf
-    - run: nix flake check --no-build --verbose
+    - run: nix registry add shajra-private github:shajra/empty
+    - run: nix flake lock --update-input shajra-private
     # DESIGN: Can't CI home because sketchybar-lua won't build on x86_64
     - run: ./darwin-rebuild --flake .#lemon-slim build