diff --git a/pyproject.toml b/pyproject.toml
index 6a256967..e0e4e76f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -102,7 +102,10 @@ system-packages = true
 [tool.hatch.envs.dev]
 dependencies = [
     "ipdb",
-    "pudb"
+    "pudb",
+    "pytest",
+    "pytest-twisted",
+    "aiosmtpd"
 ]