diff --git a/requirements-test.txt b/requirements-test.txt
index cd0ae3bef..b9cf38305 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,6 +1,6 @@
 mypy==0.910
 flake8==3.9.2
-black==21.8b0
+black==21.9b0
 
 codespell==2.1.0