diff --git a/pyproject.toml b/pyproject.toml
index e85b533..1d8ee6b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ dev = [
     # Pinned exactly so a linter release never fails an unrelated PR.
     # Bump deliberately; Dependabot proposes these weekly.
     "ruff==0.16.7",
-    "mypy==2.3.1",
+    "mypy==2.4.0",
     "types-requests>=2.28.0",
 ]