diff --git a/tests/requirements.txt b/tests/requirements.txt
index 9b6d87dd..f70ccf3f 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -5,4 +5,4 @@ pytest>=3.6.0
 pytest-cov
 funcsigs
 requests
-black ; python_version >= '3.6'
+black ; python_version >= '3.7'