diff --git a/pyproject.toml b/pyproject.toml
index 5cee4af9..d7cd49e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,7 +60,7 @@ dev = [
 ]
 lint = [
   {include-group = "test"},
-  "mypy~=1.20.0",
+  "mypy>=1.20,<2.1",
   "ruff~=0.15.1",
   "shellcheck-py~=0.11.0.1",
   "types-pygments",