diff --git a/setup.py b/setup.py
index 0d55083..6a1e1ac 100644
--- a/setup.py
+++ b/setup.py
@@ -54,7 +54,7 @@ later (LGPLv2+)',
         'suds-jurko-requests >= 1.2',
         'reportlab',
         'pytz',
-        'zeep',
+        'zeep == 2.5',
     ],
     tests_require=[
         'pytest',