diff --git a/third_party/2/requests/models.pyi b/third_party/2/requests/models.pyi
index 009492c40..a9f2b59f4 100644
--- a/third_party/2/requests/models.pyi
+++ b/third_party/2/requests/models.pyi
@@ -17,6 +17,8 @@ from . import utils
 from . import compat
 from . import status_codes
 
+from typing import Optional, Union
+
 default_hooks = hooks.default_hooks
 CaseInsensitiveDict = structures.CaseInsensitiveDict
 HTTPBasicAuth = auth.HTTPBasicAuth
@@ -77,10 +79,10 @@ class Request(RequestHooksMixin):
     def prepare(self): ...
 
 class PreparedRequest(RequestEncodingMixin, RequestHooksMixin):
-    method = ...  # type: str
-    url = ...  # type: str
-    headers = ...  # type: Dict[str, str]
-    body = ...  # type: str
+    method = ...  # type: Optional[Union[str, unicode]]
+    url = ...  # type: Optional[Union[str, unicode]]
+    headers = ...  # type: CaseInsensitiveDict
+    body = ...  # type: Optional[Union[str, unicode]]
     hooks = ...  # type: Any
     def __init__(self) -> None: ...
     def prepare(self, method=..., url=..., headers=..., files=..., data=..., params=...,
diff --git a/third_party/2/requests/structures.pyi b/third_party/2/requests/structures.pyi
index 837cf2501..a7f77b238 100644
--- a/third_party/2/requests/structures.pyi
+++ b/third_party/2/requests/structures.pyi
@@ -1,18 +1,9 @@
 # Stubs for requests.structures (Python 3)
 
-from typing import Any
-import collections
+from typing import Any, Iterator, MutableMapping, Tuple, Union
 
-class CaseInsensitiveDict(collections.MutableMapping):
-    def __init__(self, data=..., **kwargs) -> None: ...
-    def __setitem__(self, key, value): ...
-    def __getitem__(self, key): ...
-    def __delitem__(self, key): ...
-    def __iter__(self): ...
-    def __len__(self): ...
-    def lower_items(self): ...
-    def __eq__(self, other): ...
-    def copy(self): ...
+class CaseInsensitiveDict(MutableMapping[str, Union[str, unicode]]):
+    def lower_items(self) -> Iterator[Tuple[str, Union[str, unicode]]]: ...
 
 class LookupDict(dict):
     name = ...  # type: Any
diff --git a/third_party/3/requests/models.pyi b/third_party/3/requests/models.pyi
index 1e30de97f..7789899dc 100644
--- a/third_party/3/requests/models.pyi
+++ b/third_party/3/requests/models.pyi
@@ -17,6 +17,8 @@ from . import utils
 from . import compat
 from . import status_codes
 
+from typing import Optional, Union
+
 default_hooks = hooks.default_hooks
 CaseInsensitiveDict = structures.CaseInsensitiveDict
 HTTPBasicAuth = auth.HTTPBasicAuth
@@ -78,10 +80,10 @@ class Request(RequestHooksMixin):
     def prepare(self): ...
 
 class PreparedRequest(RequestEncodingMixin, RequestHooksMixin):
-    method = ...  # type: str
-    url = ...  # type: str
-    headers = ...  # type: Dict[str, str]
-    body = ...  # type: str
+    method = ...  # type: Optional[str]
+    url = ...  # type: Optional[str]
+    headers = ...  # type: CaseInsensitiveDict
+    body = ...  # type: Optional[Union[str, bytes]]
     hooks = ...  # type: Any
     def __init__(self) -> None: ...
     def prepare(self, method=..., url=..., headers=..., files=..., data=..., params=...,
diff --git a/third_party/3/requests/structures.pyi b/third_party/3/requests/structures.pyi
index 837cf2501..af4273bfd 100644
--- a/third_party/3/requests/structures.pyi
+++ b/third_party/3/requests/structures.pyi
@@ -1,18 +1,9 @@
 # Stubs for requests.structures (Python 3)
 
-from typing import Any
-import collections
+from typing import Any, Iterator, MutableMapping, Tuple, Union
 
-class CaseInsensitiveDict(collections.MutableMapping):
-    def __init__(self, data=..., **kwargs) -> None: ...
-    def __setitem__(self, key, value): ...
-    def __getitem__(self, key): ...
-    def __delitem__(self, key): ...
-    def __iter__(self): ...
-    def __len__(self): ...
-    def lower_items(self): ...
-    def __eq__(self, other): ...
-    def copy(self): ...
+class CaseInsensitiveDict(MutableMapping[str, Union[str, bytes]]):
+    def lower_items(self) -> Iterator[Tuple[str, Union[str, bytes]]]: ...
 
 class LookupDict(dict):
     name = ...  # type: Any