diff --git a/requirements.txt b/requirements.txt
index 299792604..fe0a113e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,3 +18,4 @@ pytest>=4.0.0,<4.1.0
 pytest-timeout>=1.3.0,<2.0.0
 mock>=2.0.0,<3.0.0
 flake8>=3.5.0,<3.6.0
+black