diff --git a/pyproject.toml b/pyproject.toml
index f706ca5a..9230cdd9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ anyio = "^3.4.0"
 [tool.poetry.dev-dependencies]
 pytest = "^6.2.4"
 mypy = "^0.930"
-flake8 = "^4.0.1"
+flake8 = "^5.0.4"
 black = {version = "^21.5-beta.1", python = "^3.7"}
 mkdocs = "^1.2.1"
 mkdocs-material = "^8.1.4"