diff --git a/setup.py b/setup.py
index 1c5223a..66552be 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@
       zip_safe=False,
       install_requires=[
           "TurboGears2 >= 2.3.2",
-          "repoze.sendmail >= 4.1",
+          "repoze.sendmail == 4.1",
       ],
       extras_require={
            # Used by Travis and Coverage due to setup.py nosetests