diff --git a/setup.py b/setup.py
index d158456..b49befd 100644
--- a/setup.py
+++ b/setup.py
@@ -37,7 +37,7 @@
       ],
       extras_require={
           ':sys_platform=="win32"': ["pywin32"],
-          "dev": ["mock", "treq", "tox", "pyflakes"],
+          "dev": ["mock", "treq", "tox", "pyflakes", "dulwich", "docutils", "gpg", "wheel"],
       },
       test_suite="wormhole_mailbox_server.test",
       cmdclass=commands,