diff --git a/pyproject.toml b/pyproject.toml
index d6cc581c..7bae6919 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ dependencies = [
 tests = [
     "pytest>=3.2.1,!=3.3.0",
     "hypothesis>=3.27.0",
+    "mypy>=1.4.1",
 ]
 docs = [
     "sphinx<7",