ERROR 2020-12-14 20:35:43,674 sentry.errors._failed_send:684>> Sentry responded with an API error: RateLimited(None)

Since the 5th of May, we cannot send any message to sentry without getting this error:
ERROR 2020-12-14 20:35:43,674 sentry.errors._failed_send:684>> Sentry responded with an API error: RateLimited(None)

We are working on Django using raven==6.10.0
As anyone faced this issue? We suspected a billing issue but after updating the payment method we still get this error.