diff --git a/pyproject.toml b/pyproject.toml
index 47390cc..d09c979 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ test = [
     "pytest-mock >=3.0.0,<4.0.0",
     "black ==23.7.0",
     "mypy >=1.0.0",
-    "flake8 >=4.0.0,<5.0.0",
+    "flake8 >=4.0.0,<7.0.0",
     "isort >=5.0.0,<7.0.0",
     "ruff ==0.1.3",
     "types-requests >=2.20.0,<3.0.0",