diff --git a/pyproject.toml b/pyproject.toml
index 7dc87c9..2c00005 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ test = [
   "coverage[toml] >= 6.5.0,< 8.0"
 ]
 dev = [
-  "mypy ==1.1.1",
+  "mypy ==1.4.0",
   "ruff ==0.0.257",
   "black ==23.1.0",
   "isort >=5.0.6,<6.0.0",