--- a/setup.py
+++ b/setup.py
@@ -14,10 +14,9 @@
     url="https://github.com/pazz/urwidtrees",
     license="Licensed under the GNU GPL v3+.",
     packages=['urwidtrees'],
-    install_requires=['urwid>=1.1.0', 'mock'],
+    install_requires=['urwid>=1.1.0'],
     extras_require={
         'docs': [
-            'mock',
         ],
     },
 )
--- a/urwidtrees.egg-info/requires.txt
+++ b/urwidtrees.egg-info/requires.txt
@@ -1,5 +1,3 @@
 urwid>=1.1.0
-mock
 
 [docs]
-mock
