diff --git a/test-requirements.txt b/test-requirements.txt
index a50905f..565198b 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,4 +5,5 @@
 mock>=2.0.0 # BSD
 coverage!=4.4,>=4.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
+pycodestyle>=2.0.0,<2.6.0 # MIT
 flake8-import-order==0.11 # LGPLv3