diff --git a/pyproject.toml b/pyproject.toml
index c99646df..55c6bff5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -81,7 +81,7 @@ dev = [
     "ruff==0.3.5",
     "black==24.4.0",
     "isort==5.13.2",
-    "mypy==1.8.0",
+    "mypy==1.9.0",
     "psutil==5.9.2",
     "stix2==3.0.1",
     "requests==2.31.0",