diff --git a/pyproject.toml b/pyproject.toml
index b0e94f22..a19b029f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -72,7 +72,7 @@ mss = "mss.__main__:main"
 [project.optional-dependencies]
 dev = [
   "build==1.3.0",
-  "mypy==1.17.1",
+  "mypy==1.18.1",
   "ruff==0.13.0",
   "twine==6.2.0",
 ]