diff --git a/pyproject.toml b/pyproject.toml
index 6c972b2..4954051 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ classifiers = [
 dev = [
     "pytest>=8.0",
     "pytest-cov>=4.0",
-    "mypy>=1.0",
+    "mypy>=1.20.0",
     "ruff>=0.4",
 ]