diff --git a/third_party/2/werkzeug/wrappers.pyi b/third_party/2/werkzeug/wrappers.pyi
index 98b258241b28..d9bf4e3b2b0d 100644
--- a/third_party/2/werkzeug/wrappers.pyi
+++ b/third_party/2/werkzeug/wrappers.pyi
@@ -1,5 +1,5 @@
 from typing import (
-    Any, Iterable, Mapping, Optional, Sequence, Tuple, Type, Union,
+    Any, Iterable, Mapping, Optional, Sequence, Tuple, Type, Union, Dict,
 )
 
 from .datastructures import (
@@ -18,9 +18,9 @@ class BaseRequest:
     form_data_parser_class = ...  # type: Type
     trusted_hosts = ...  # type: Optional[Sequence[unicode]]
     disable_data_descriptor = ...  # type: Any
-    environ = ...  # type: Mapping[str, object]
+    environ = ...  # type: Dict[Union[str, unicode], Any]
     shallow = ...  # type: Any
-    def __init__(self, environ: Mapping[basestring, object], populate_request: bool = ..., shallow: bool = ...) -> None: ...
+    def __init__(self, environ: Dict[Union[str, unicode], Any], populate_request: bool = ..., shallow: bool = ...) -> None: ...
     @property
     def url_charset(self) -> str: ...
     @classmethod
diff --git a/third_party/3/werkzeug/wrappers.pyi b/third_party/3/werkzeug/wrappers.pyi
index 676d1be4c1e9..08bf9d42ebe2 100644
--- a/third_party/3/werkzeug/wrappers.pyi
+++ b/third_party/3/werkzeug/wrappers.pyi
@@ -1,5 +1,5 @@
 from typing import (
-    Any, Iterable, Mapping, Optional, Sequence, Tuple, Type, Union,
+    Any, Iterable, Mapping, Optional, Sequence, Tuple, Type, Union, Dict,
 )
 
 from .datastructures import (
@@ -18,9 +18,9 @@ class BaseRequest:
     form_data_parser_class = ...  # type: Type
     trusted_hosts = ...  # type: Optional[Sequence[str]]
     disable_data_descriptor = ...  # type: Any
-    environ = ...  # type: Mapping[str, object]
+    environ = ...  # type: Dict[str, Any]
     shallow = ...  # type: Any
-    def __init__(self, environ: Mapping[str, object], populate_request: bool = ..., shallow: bool = ...) -> None: ...
+    def __init__(self, environ: Dict[str, Any], populate_request: bool = ..., shallow: bool = ...) -> None: ...
     @property
     def url_charset(self) -> str: ...
     @classmethod