diff --git a/dev-requirements.txt b/dev-requirements.txt
index 6e055cc1..033eff56 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -5,6 +5,6 @@ chardet==4.0.*
 Flask>=2.0,<3.0; python_version >= '3.6'
 requests>=2.26,<3.0; python_version >= '3.6'
 black==21.9b0; python_version >= '3.6'
-flake8==3.9.2; python_version >= '3.6'
+flake8==4.0.0; python_version >= '3.6'
 mypy==0.910; python_version >= '3.6'
 isort; python_version >= '3.6'