diff --git a/requirements-testing.txt b/requirements-testing.txt
index 166756e..9402ae7 100644
--- a/requirements-testing.txt
+++ b/requirements-testing.txt
@@ -9,7 +9,7 @@ types-PyYAML ~= 6.0
 # that is incompatible with black 25 (last version supporting Python 3.9).
 black == 25.11.*
 ruff == 0.15.*
-mypy == 2.2.*; python_version >= "3.10"
+mypy == 2.3.*; python_version >= "3.10"
 mypy == 1.19.*; python_version < "3.10"
 # pydantic: required by the legacy model_v0 (Pydantic) test suite,
 # which lives alongside the new Rust-backed model_v1 implementation.