diff --git a/src/models.py b/src/models.py
index 4451711..e12618a 100644
--- a/src/models.py
+++ b/src/models.py
@@ -58,7 +58,7 @@ class Address(BaseModel):
     zipcode: Optional[str] = Field("", description="Zip code")
 
 class EstimationRequest(BaseModel):
-    userId: Optional[str] = Field(None, description="Unique identifier")
+    userId: str | int | None = Field(None, description="Unique identifier")
     applicants: List[Applicant]
     plans: List[Plan]
     phq: PHQ