diff --git a/pyproject.toml b/pyproject.toml
index c695191..d1b07bd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -78,7 +78,7 @@ dependencies = [
 [project.optional-dependencies]
 develop = [
   "black<24",
-  "mypy==1.4.1",
+  "mypy==1.5.1",
   "poethepoet<0.21",
   "pyproject-fmt<0.13",
   "ruff==0.0.277",