Forms for Salesforce
Salesforce is introducing mandatory security updates that may impact your Forms for Salesforce integration. To avoid disruption, please confirm your managed package is updated to version 4.148 or later.
Formstack Documents / Documents for Salesforce
These updates may impact workflows using Salesforce in Formstack Documents. No action is required today, but some users may need to reconnect their Salesforce authorization on or after May 11.
Additional details are available in Salesforce's announcement in Salesforce Partner Community.