diff --git a/pyproject.toml b/pyproject.toml
index a069413..aeef272 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ dev = [
     "pre-commit==2.21.0",
     "ruff==0.4.0",
     "black==24.3.0",
-    "mypy==1.5.1",
+    "mypy==1.9.0",
     "pytest==8.0.0",
 ]
 docs = [