diff --git a/pyproject.toml b/pyproject.toml
index 11eff33..6fbc121 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ dev = [
     "pytest>=8.0",
     "pytest-cov>=5.0",
     "ruff>=0.4",
-    "mypy>=1.10",
+    "mypy>=1.20.1",
     "types-pyyaml>=6.0.12.20250915",
     "types-pytz>=2026.1.1.20260304",
 ]