diff --git a/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/base.pyi b/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/base.pyi
index 2a75404ff..126332226 100644
--- a/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/base.pyi
+++ b/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/base.pyi
@@ -46,9 +46,9 @@ class Client:
     ) -> None: ...
     @property
     def token_types(self): ...
-    def prepare_request_uri(self, *args, **kwargs) -> None: ...
-    def prepare_request_body(self, *args, **kwargs) -> None: ...
-    def parse_request_uri_response(self, *args, **kwargs) -> None: ...
+    def prepare_request_uri(self, *args, **kwargs) -> str: ...
+    def prepare_request_body(self, *args, **kwargs) -> str: ...
+    def parse_request_uri_response(self, *args, **kwargs) -> dict[str, str]: ...
     def add_token(
         self,
         uri,