diff --git a/test-requirements.txt b/test-requirements.txt
index a41e5f0bd..337a1804f 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,5 +10,6 @@ stestr>=2.0.0 # Apache-2.0
 testtools>=2.2.0 # MIT
 Pygments>=2.2.0 # BSD license
 flake8-import-order>=0.17.1 # LGPLv3
+pycodestyle>=2.0.0,<2.7.0 # MIT
 
 openstacksdk>=0.37.0 # Apache-2.0