diff --git a/pyproject.toml b/pyproject.toml
index e1d5395..ac60fa7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dev = [
     "pytest>=8.0",
     "httpx>=0.28",
     "ruff>=0.11",
-    "mypy>=1.15",
+    "mypy>=1.20.1",
     "types-pyyaml>=6.0",
 ]