diff --git a/pyproject.toml b/pyproject.toml
index 6601c57..c6d886c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -86,7 +86,7 @@ dependencies = [
 [project.optional-dependencies]
 develop = [
   "black<24",
-  "mypy==1.5.1",
+  "mypy==1.6.1",
   "poethepoet<0.25",
   "pyproject-fmt<1.3",
   "ruff==0.0.292",