diff --git a/third_party/2/six/__init__.pyi b/third_party/2/six/__init__.pyi
index f1e4246d2..c4bff59e5 100644
--- a/third_party/2/six/__init__.pyi
+++ b/third_party/2/six/__init__.pyi
@@ -5,7 +5,7 @@ from __future__ import print_function
 import types
 from typing import (
     Any, AnyStr, Callable, Dict, Iterable, Mapping, NoReturn, Optional,
-    Pattern, Tuple, Type, TypeVar, Union, overload, ValuesView, KeysView, ItemsView
+    Pattern, Text, Tuple, Type, TypeVar, Union, overload, ValuesView, KeysView, ItemsView,
 )
 import typing
 import unittest
@@ -90,4 +90,7 @@ print_ = print
 
 def with_metaclass(meta: type, *bases: type) -> type: ...
 def add_metaclass(metaclass: type) -> Callable[[_T], _T]: ...
+def ensure_binary(s: Union[bytes, Text], encoding: str = ..., errors: str = ...) -> bytes: ...
+def ensure_str(s: Union[bytes, Text], encoding: str = ..., errors: str = ...) -> str: ...
+def ensure_text(s: Union[bytes, Text], encoding: str = ..., errors: str = ...) -> Text: ...
 def python_2_unicode_compatible(klass: _T) -> _T: ...
diff --git a/third_party/3/six/__init__.pyi b/third_party/3/six/__init__.pyi
index 4eedd5b40..a500d42e9 100644
--- a/third_party/3/six/__init__.pyi
+++ b/third_party/3/six/__init__.pyi
@@ -14,6 +14,7 @@ from typing import (
     NoReturn,
     Optional,
     Pattern,
+    Text,
     Tuple,
     Type,
     TypeVar,
@@ -101,4 +102,7 @@ print_ = print
 
 def with_metaclass(meta: type, *bases: type) -> type: ...
 def add_metaclass(metaclass: type) -> Callable[[_T], _T]: ...
+def ensure_binary(s: Union[bytes, Text], encoding: str = ..., errors: str = ...) -> bytes: ...
+def ensure_str(s: Union[bytes, Text], encoding: str = ..., errors: str = ...) -> str: ...
+def ensure_text(s: Union[bytes, Text], encoding: str = ..., errors: str = ...) -> Text: ...
 def python_2_unicode_compatible(klass: _T) -> _T: ...