diff --git a/dev-requirements.txt b/dev-requirements.txt
index 936a8d1..2d15229 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -3,7 +3,7 @@
 # Source of truth: pyproject.toml (though dev deps may not be fully specified there)
 ruff==0.15.16
 flake8~=7.3
-mypy==1.6.0
+mypy==2.1.0
 pytest>=9.0.3
 pytest-cov~=6.0
 pre-commit~=3.5