diff --git a/requirements_test.txt b/requirements_test.txt
index 02e93e61947..162a4d89ee5 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -5,3 +5,4 @@ pytest>=2.8.0
 pytest-cov>=2.2.0
 pytest-timeout>=1.0.0
 betamax>=0.5.1
+pydocstyle>=1.0.0