diff --git a/pyproject.toml b/pyproject.toml
index 87b200e..8ff7b32 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = ["tomli>=2.0; python_version < '3.11'"]
 [project.optional-dependencies]
 dev = [
   "build>=1.0",
-  "mypy>=1.8,<1.20",
+  "mypy>=1.8,<2.4",
   "pytest>=7.4",
   "pytest-cov>=4.1",
   "ruff>=0.4",