diff --git a/setup.py b/setup.py
index 8551821..741fc84 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,6 @@ install_requires = [
     # 1.1.0+ is required to avoid the warnings described at
     # https://github.com/certbot/josepy/issues/13.
     'josepy>=1.1.0',
-    'mock',
     # Connection.set_tlsext_host_name (>=0.13)
     'PyOpenSSL>=0.13.1',
     'pyrfc3339',