diff --git a/pyproject.toml b/pyproject.toml
index ca936fa..93ab6ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ Documentation = "https://peekxc.github.io/simplextree-py/pages/"
 [project.optional-dependencies]
 dev = [
 	"ruff",
-	"mypy>=1.0,<1.6",
+	"mypy>=1.0,<1.10",
 	"black>=23.0,<24.0",
 	"isort>=5.12,<5.13",
 	"pytest",