diff --git a/pyproject.toml b/pyproject.toml
index 11fc0a862..a98141f5e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ version = "0.78.0"
 [project.optional-dependencies]
 test = [
     "codespell==2.2.6",
-    "mypy==1.8.0",
+    "mypy==1.9.0",
     "pre-commit==3.6.2",
     "pre-commit-hooks==4.5.0",
     "pylint==3.1.0",