diff --git a/pyproject.toml b/pyproject.toml
index 6d29f39..52f53bb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ target_version = ["py36", "py37", "py38"]
 [tool.pdm.dev-dependencies]
 dev = [
     "black==24.2.0",
-    "mypy==1.3",
+    "mypy==1.9.0",
     "pylint==3.1.0",
     "pytest==8.1.1",
     "tox==4.14.1",