diff --git a/requirements-dev.txt b/requirements-dev.txt
index a5a063f..88a6db0 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,4 +3,4 @@ pytest
 pytest-cov
 flake8==3.9.1
 autopep8==1.5.7
-black==21.4b2
+black==21.7b0