diff --git a/cutt/security.py b/cutt/security.py
index 61f572e..519f65b 100644
--- a/cutt/security.py
+++ b/cutt/security.py
@@ -337,6 +337,7 @@ class RegisterRequest(BaseModel):
     team_id: int
     display_name: str
     username: str
+    gender: str | None
     password: str
     email: str | None
     number: str | None
@@ -379,6 +380,7 @@ async def register(req: RegisterRequest):
             hashed_password=get_password_hash(req.password),
             display_name=req.display_name,
             email=req.email if req.email else None,
+            gender=req.gender,
             number=req.number,
             disabled=False,
             teams=[team],