diff --git a/pyproject.toml b/pyproject.toml
index 0d677af..923efa2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -110,7 +110,7 @@ dev = [
     "poethepoet >=0.0.1,<1",
     "ruff==0.9.8",
     "mypy==1.10.0; python_version<'3.9'",
-    "mypy>=1.7,<2; python_version>='3.9'",
+    "mypy>=1.7,<3; python_version>='3.9'",
     "build",
     "types-pyserial",
     "pytest",