diff --git a/pyproject.toml b/pyproject.toml
index 8a9d580..f0bdc4e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ dynamic = ["version"]
 
 [project.optional-dependencies]
 test =[
-    "flake8~=5.0",
+    "flake8>=5,<7",
     "pylint~=2.12",
     "pytest~=7.2",
     "pytest-cov~=4.0",