diff --git a/therapy/etl/drugsatfda.py b/therapy/etl/drugsatfda.py
index 7b0ec272..b54bde1e 100644
--- a/therapy/etl/drugsatfda.py
+++ b/therapy/etl/drugsatfda.py
@@ -36,7 +36,9 @@ def get_latest_version(self) -> str:
                 raise DownloadException(msg)
             return date
         else:
-            raise requests.HTTPError("Unable to retrieve version from FDA API")
+            raise requests.HTTPError(
+                "Unable to retrieve version from FDA API", response=requests.Response()
+            )
 
     def _load_meta(self) -> None:
         """Add Drugs@FDA metadata."""
diff --git a/therapy/schemas.py b/therapy/schemas.py
index 0067114d..f2c70bd6 100644
--- a/therapy/schemas.py
+++ b/therapy/schemas.py
@@ -1,11 +1,11 @@
 """This module contains data models for representing VICC therapy records."""
-from typing import List, Optional, Dict, Union, Any, Type, Set
+from typing import List, Optional, Dict, Union, Any, Type, Set, Literal
 from enum import Enum, IntEnum
 from datetime import datetime
 
 from ga4gh.vrsatile.pydantic.core_models import CURIE
 from ga4gh.vrsatile.pydantic.vrsatile_models import TherapeuticDescriptor
-from pydantic import BaseModel, StrictBool
+from pydantic import BaseModel, StrictBool, StrictStr
 
 from therapy.version import __version__
 
@@ -395,10 +395,12 @@ def schema_extra(schema: Dict[str, Any], model: Type["MatchesListed"]) -> None:
 class ServiceMeta(BaseModel):
     """Metadata regarding the therapy-normalization service."""
 
-    name = "thera-py"
-    version = __version__
+    name: Literal["thera-py"] = "thera-py"
+    version: StrictStr = __version__
     response_datetime: datetime
-    url = "https://github.com/cancervariants/therapy-normalization"
+    url: Literal[
+        "https://github.com/cancervariants/therapy-normalization"
+    ] = "https://github.com/cancervariants/therapy-normalization"
 
     class Config:
         """Configure OpenAPI schema"""