diff --git a/pyproject.toml b/pyproject.toml
index 4944fdc2..eb8655b8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,7 +67,7 @@ test = [
   "pytest-timeout",  # Timeout protection for CI/CD
   "rich",
   "ruff",
-  "mypy~=1.13.0", # pinned to old for python 3.8
+  "mypy>=1.13,<1.20", # pinned to old for python 3.8
   'typing-extensions; python_version < "3.11"',
   "wheel",
   "griffe",