diff --git a/requirements-test.txt b/requirements-test.txt
index 2fec69d..89b9820 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,6 +1,6 @@
 pytest==6.2.*
 pytest-cov==2.11.*
-black==20.8b1
+black==21.9b0
 isort==5.7.*
 flake8==3.8.*
 mypy==0.790