diff --git a/pyproject.toml b/pyproject.toml
index de02689..1e75978 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ dependencies = []
 [dependency-groups]
 dev = [
     "bandit>=1.8",
-    "mypy>=1.15",
+    "mypy>=1.20.1",
     "pip-audit>=2.9",
     "pytest>=8.0",
     "ruff>=0.9",