diff --git a/flake.nix b/flake.nix
index 9bb6f35..92a56cb 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,6 +16,7 @@
         pkgs.mkShell
           {
             buildInputs = [
+              pkgs.mkcert
               pkgs.git
               pkgs.ddev
               pkgs.php82