diff --git a/mcp-instructions-server/pyproject.toml b/mcp-instructions-server/pyproject.toml
index 78511bc..80eaf91 100644
--- a/mcp-instructions-server/pyproject.toml
+++ b/mcp-instructions-server/pyproject.toml
@@ -17,7 +17,7 @@ dependencies = [
 dev = [
     "pytest>=8.0",
     "ruff>=0.8.0",
-    "mypy>=1.13.0",
+    "mypy>=1.20.0",
     "types-PyYAML>=6.0.12.20240917",
 ]