diff --git a/third_party/2/google/protobuf/internal/containers.pyi b/third_party/2/google/protobuf/internal/containers.pyi
index 46222e28a..c78fadf55 100644
--- a/third_party/2/google/protobuf/internal/containers.pyi
+++ b/third_party/2/google/protobuf/internal/containers.pyi
@@ -1,12 +1,14 @@
 from google.protobuf.descriptor import Descriptor
 from google.protobuf.internal.message_listener import MessageListener
 from google.protobuf.message import Message
-from typing import Sequence, TypeVar, Generic, Any, Iterator, Iterable, Union, Optional, Callable
+from typing import (
+    MutableSequence, Sequence, TypeVar, Generic, Any, Iterator, Iterable,
+    Union, Optional, Callable
+)
 
 _T = TypeVar('_T')
-class BaseContainer(Generic[_T]):
+class BaseContainer(Generic[_T], MutableSequence[_T]):
     def __init__(self, message_listener: MessageListener) -> None: ...
-    def __getitem__(self, key: int) -> _T: ...
     def __len__(self) -> int: ...
     def __ne__(self, other: object) -> bool: ...
     def __hash__(self) -> int: ...
@@ -15,25 +17,12 @@ class BaseContainer(Generic[_T]):
 
 class RepeatedScalarFieldContainer(Generic[_T], BaseContainer[_T]):
     def __init__(self, message_listener: MessageListener, message_descriptor: Descriptor) -> None: ...
-    def append(self, value: _T) -> None: ...
-    def insert(self, key: int, value: _T) -> None: ...
-    def extend(self, elem_seq: Sequence[_T]) -> None: ...
     def MergeFrom(self, other: RepeatedScalarFieldContainer[_T]) -> None: ...
-    def remove(self, elem: _T) -> None: ...
-    def pop(self, key: int = ...) -> _T: ...
-    def __iter__(self) -> Iterator[_T]: ...
-    def __delitem__(self, key: Union[int, slice]) -> None: ...
-    def __setitem__(self, key: int, value: _T) -> None: ...
 
 class RepeatedCompositeFieldContainer(Generic[_T], BaseContainer[_T]):
     def __init__(self, message_listener: MessageListener, type_checker: Any) -> None: ...
     def add(self, **kwargs: Any) -> _T: ...
-    def extend(self, elem_seq: Sequence[_T]) -> None: ...
     def MergeFrom(self, other: RepeatedCompositeFieldContainer[_T]) -> None: ...
-    def remove(self, elem: _T) -> None: ...
-    def pop(self, key: int = ...) -> _T: ...
-    def __iter__(self) -> Iterator[_T]: ...
-    def __delitem__(self, key: Union[int, slice]) -> None: ...
 
 # Classes not yet typed
 class Mapping(Any):