diff --git a/packages/clerk-js/src/ui/components/SignUp/SignUpStart.tsx b/packages/clerk-js/src/ui/components/SignUp/SignUpStart.tsx
index 9a425e3ea70..700d4b24baf 100644
--- a/packages/clerk-js/src/ui/components/SignUp/SignUpStart.tsx
+++ b/packages/clerk-js/src/ui/components/SignUp/SignUpStart.tsx
@@ -232,8 +232,10 @@ function _SignUpStart(): JSX.Element {
     const redirectUrl = buildSSOCallbackURL(ctx, displayConfig.signUpUrl);
     const redirectUrlComplete = ctx.afterSignUpUrl || '/';
 
-    return signUp
-      .create(buildRequest(fieldsToSubmit))
+    const requestParams = buildRequest(fieldsToSubmit);
+    const signUpRequest = signUp.id ? signUp.update(requestParams) : signUp.create(requestParams);
+
+    return signUpRequest
       .then(res =>
         completeSignUpFlow({
           signUp: res,