diff --git a/requirements_test.txt b/requirements_test.txt
index dd68c62..be70724 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -1,4 +1,4 @@
-black==20.8b1
+black==21.4b0
 codespell==2.0.0
 flake8==3.9.0
 mypy==0.812