diff --git a/pyproject.toml b/pyproject.toml
index 0f30cd23..189b1d5e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -72,7 +72,7 @@ mss = "mss.__main__:main"
 [project.optional-dependencies]
 dev = [
   "build==1.2.2.post1",
-  "mypy==1.15.0",
+  "mypy==1.17.0",
   "ruff==0.11.11",
   "twine==6.1.0",
 ]