diff --git a/pyproject.toml b/pyproject.toml
index ccbaba2..187580f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ dev = [
     "Hydro-Quebec-API-Wrapper==4.2.6",
     "homeassistant-stubs>=2025.1.0",  # Type stubs for HA API compatibility checking
     "ruff>=0.8.0",
-    "mypy>=1.13.0",
+    "mypy>=1.20.1",
     "pytest>=8.3.0",
     "pytest-asyncio>=0.24.0",
     "pytest-homeassistant-custom-component>=0.13.0",