diff --git a/stubs/protobuf/google/protobuf/internal/containers.pyi b/stubs/protobuf/google/protobuf/internal/containers.pyi
index 30a37353c125..aaa970439216 100644
--- a/stubs/protobuf/google/protobuf/internal/containers.pyi
+++ b/stubs/protobuf/google/protobuf/internal/containers.pyi
@@ -33,7 +33,7 @@ class RepeatedScalarFieldContainer(BaseContainer[_ScalarV]):
     def append(self, value: _ScalarV) -> None: ...
     def insert(self, key: int, value: _ScalarV) -> None: ...
     def extend(self, elem_seq: Iterable[_ScalarV] | None) -> None: ...
-    def MergeFrom(self: _M, other: _M) -> None: ...
+    def MergeFrom(self: _M, other: _M | Iterable[_ScalarV]) -> None: ...
     def remove(self, elem: _ScalarV) -> None: ...
     def pop(self, key: int = -1) -> _ScalarV: ...
     @overload
@@ -49,7 +49,7 @@ class RepeatedCompositeFieldContainer(BaseContainer[_MessageV]):
     def append(self, value: _MessageV) -> None: ...
     def insert(self, key: int, value: _MessageV) -> None: ...
     def extend(self, elem_seq: Iterable[_MessageV]) -> None: ...
-    def MergeFrom(self: _M, other: _M) -> None: ...
+    def MergeFrom(self: _M, other: _M | Iterable[_MessageV]) -> None: ...
     def remove(self, elem: _MessageV) -> None: ...
     def pop(self, key: int = -1) -> _MessageV: ...
     def __delitem__(self, key: int | slice) -> None: ...