diff --git a/zulip/setup.py b/zulip/setup.py
index 1c67dc1..727a278 100755
--- a/zulip/setup.py
+++ b/zulip/setup.py
@@ -55,6 +55,7 @@ setuptools_info = dict(
     install_requires=['requests>=0.12.1',
                       'six',
                       'typing>=3.5.2.2',
+                      'mock',
                       ],
 )
 
diff --git a/zulip_botserver/setup.py b/zulip_botserver/setup.py
index b7b1480..3074f23 100644
--- a/zulip_botserver/setup.py
+++ b/zulip_botserver/setup.py
@@ -38,6 +38,7 @@ setuptools_info = dict(
         'zulip',
         'zulip_bots',
         'flask>=0.12.2',
+        'mock',
     ],
 )