diff --git a/requirements-tests.txt b/requirements-tests.txt
index c89e415fcc23..52d56b5ed1fd 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -3,7 +3,7 @@
 mypy==2.4.0
 pyrefly==1.3.2
 pyright==1.1.414
-ty==0.0.86
+ty==0.0.87
 
 # Libraries used by our various scripts.
 aiohttp==3.14.4
diff --git a/ty.toml b/ty.toml
index c8e25c43f69b..476a9d55c0fb 100644
--- a/ty.toml
+++ b/ty.toml
@@ -17,6 +17,7 @@ allowed-unresolved-imports = [
 deprecated = "ignore"
 invalid-attribute-override = "ignore"
 invalid-method-override = "ignore"
+invalid-mutable-override = "ignore"
 invalid-property-type-override = "ignore"
 override-of-final-method = "ignore"
 # Some `__init__` self annotations retain class-scoped type variables for mypy