diff --git a/CHANGELOG.md b/CHANGELOG.md
index c89d800eb..abf1caed6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [0.30.3] - 2025-08-28
 - Fixes webauthn MFA integration
+- Adds missing `rp_id` field to Webauthn's `SignInOptionResponse`
 
 ## [0.30.2] - 2025-08-14
 - Adds Webauthn user editing support to the Dashboard
diff --git a/supertokens_python/recipe/webauthn/interfaces/recipe.py b/supertokens_python/recipe/webauthn/interfaces/recipe.py
index 67dcbe012..ded89bd39 100644
--- a/supertokens_python/recipe/webauthn/interfaces/recipe.py
+++ b/supertokens_python/recipe/webauthn/interfaces/recipe.py
@@ -236,6 +236,7 @@ class SignInOptionsResponse(OkResponseBaseModel):
     webauthn_generated_options_id: str
     created_at: int
     expires_at: int
+    rp_id: str
     challenge: str
     timeout: int
     user_verification: UserVerification