We do not allow you update email ID associated with your Goibibo account for technical reason. However, you can update your new mobile number from your app.
It is very easy to update your new number on the app if you have signed up with your email id.
Go to your profile on the app > click on settings > sign-out > then sign back in with the new number > verify the OTP with the new number. On next screen, there will be two options either create a new account or link your previous account - Use “Link with your phone” feature. Once done, login with the email id and password on which you want to update the mobile number and you are done updating your new number with us.