Apps Script legacy Rhino runtime stopped executing on January 31, 2026

Who is affected

Organizations with Apps Script projects, add-ons, automations, triggers, or web apps that still depend on the legacy Rhino runtime. Workspace super admins are relevant when they coordinate or enforce the migration, but the direct remediation usually belongs to script owners and developers.

Admin roles to involve: Apps Script / automation owners, Developers

What administrators should do

Identify Apps Script projects that still depend on the legacy Rhino runtime, including bound scripts, add-ons, automations, web apps, triggers, and deployed versions. Migrate them to the V8 runtime, update Rhino-only syntax or incompatible behavior, and retest triggers, add-ons, web apps, and versioned deployments. Rhino was deprecated on February 20, 2025 and stopped executing after January 31, 2026.

What happens if this is ignored

Any project that still depends on Rhino no longer executes, which can break automations, add-ons, triggers, and web apps until the project is migrated and retested on V8.