diff --git a/packages/abstractions/kiota_abstractions/request_adapter.py b/packages/abstractions/kiota_abstractions/request_adapter.py
index 5fe2eee7..2baae6be 100644
--- a/packages/abstractions/kiota_abstractions/request_adapter.py
+++ b/packages/abstractions/kiota_abstractions/request_adapter.py
@@ -3,22 +3,24 @@
 from abc import ABC, abstractmethod
 from datetime import date, datetime, time, timedelta
 from io import BytesIO
-from typing import Generic, Optional, TypeVar, Union
+from typing import Generic, Optional, Union
 from uuid import UUID
 
+from typing_extensions import TypeVar
+
 from .request_information import RequestInformation
 from .serialization import Parsable, ParsableFactory, SerializationWriterFactory
 from .store import BackingStoreFactory
 
 ResponseType = TypeVar("ResponseType")
 ModelType = TypeVar("ModelType", bound=Parsable)
-RequestType = TypeVar("RequestType")
+RequestType_co = TypeVar("RequestType_co", covariant=True, default=object)
 PrimitiveType = TypeVar(
     "PrimitiveType", bool, str, int, float, UUID, datetime, timedelta, date, time, bytes
 )
 
 
-class RequestAdapter(ABC, Generic[RequestType]):
+class RequestAdapter(ABC, Generic[RequestType_co]):
     """Service responsible for translating abstract Request Info into concrete native HTTP requests.
     """
     # The base url for every request.
@@ -143,13 +145,13 @@ def enable_backing_store(self, backing_store_factory: Optional[BackingStoreFacto
         pass
 
     @abstractmethod
-    async def convert_to_native_async(self, request_info: RequestInformation) -> RequestType:
+    async def convert_to_native_async(self, request_info: RequestInformation) -> RequestType_co:
         """Translates the request information object into a native HTTP client request object.
 
         Args:
             request_info (RequestInformation): request information object to be converted.
 
         Returns:
-            RequestType: the natively typed HTTP request of the client.
+            RequestType_co: the natively typed HTTP request of the client.
         """
         pass
diff --git a/packages/abstractions/kiota_abstractions/serialization/parsable_factory.py b/packages/abstractions/kiota_abstractions/serialization/parsable_factory.py
index 139883ed..46c891c8 100644
--- a/packages/abstractions/kiota_abstractions/serialization/parsable_factory.py
+++ b/packages/abstractions/kiota_abstractions/serialization/parsable_factory.py
@@ -1,10 +1,12 @@
 from abc import abstractmethod
-from typing import Generic, Optional, Protocol, TypeVar
+from typing import Generic, Optional, Protocol
+
+from typing_extensions import TypeVar
 
 from .parsable import Parsable
 from .parse_node import ParseNode
 
-U_co = TypeVar("U_co", bound="Parsable", covariant=True)
+U_co = TypeVar("U_co", bound="Parsable", covariant=True, default="Parsable")
 
 
 class ParsableFactory(Protocol, Generic[U_co]):
diff --git a/packages/abstractions/pyproject.toml b/packages/abstractions/pyproject.toml
index a34d9f87..c4426146 100644
--- a/packages/abstractions/pyproject.toml
+++ b/packages/abstractions/pyproject.toml
@@ -24,6 +24,7 @@ dependencies = [
     "std-uritemplate>=2.0.0",
     "opentelemetry-api>=1.27.0",
     "opentelemetry-sdk>=1.27.0",
+    "typing-extensions>=4.4.0",
 ]
 
 [project.urls]
diff --git a/packages/http/httpx/kiota_http/httpx_request_adapter.py b/packages/http/httpx/kiota_http/httpx_request_adapter.py
index 27faeb95..01ae080c 100644
--- a/packages/http/httpx/kiota_http/httpx_request_adapter.py
+++ b/packages/http/httpx/kiota_http/httpx_request_adapter.py
@@ -215,7 +215,7 @@ async def send_async(
     async def send_collection_async(
         self,
         request_info: RequestInformation,
-        parsable_factory: ParsableFactory,
+        parsable_factory: ParsableFactory[ModelType],
         error_map: Optional[dict[str, type[ParsableFactory]]],
     ) -> Optional[list[ModelType]]:
         """Excutes the HTTP request specified by the given RequestInformation and returns the
diff --git a/tests/validation/pyproject.toml b/tests/validation/pyproject.toml
index 62618ffd..2ae742ba 100644
--- a/tests/validation/pyproject.toml
+++ b/tests/validation/pyproject.toml
@@ -1,5 +1,6 @@
 [tool.mypy]
 warn_unused_configs = true
+strict = true
 files = "validation"
 
 [tool.yapf]