diff --git a/extra/requirements-dev.txt b/extra/requirements-dev.txt
index 2e7dfad..e764038 100644
--- a/extra/requirements-dev.txt
+++ b/extra/requirements-dev.txt
@@ -5,7 +5,7 @@ flake8-chart>=0.1.5
 flake8-comprehensions>=3.17.0
 flake8-copyright>=0.2
 flake8-import-order>=0.19.2
-flake8-string-format>=0.3
+flake8-string-format>=0.4.0
 pep8-naming>=0.15.1
 pydocstyle>=6.3.0
 pytest-html>=4.2.0