diff --git a/nix-darwin/ci/github-runner.nix b/nix-darwin/ci/github-runner.nix
index 1db3388..07ebfa6 100644
--- a/nix-darwin/ci/github-runner.nix
+++ b/nix-darwin/ci/github-runner.nix
@@ -65,7 +65,7 @@
           };
           nixos-flake = {
             url = "https://github.com/srid/nixos-flake";
-            num = 3;
+            num = 2 * 5;
           };
           haskell-flake = {
             url = "https://github.com/srid/haskell-flake";