IT Admin Change Calendar Google Workspace
Apps Script legacy Rhino runtime stops executing on January 31, 2026
Apps Script scripts still on the legacy Rhino runtime stop running on January 31, 2026. Migrate them to the V8 runtime before then.
Product
Google Apps Script
Announced
20 February 2025
Effective from
31 January 2026
Who is affected
Organizations relying on Google Apps Script automations, add-ons, or web apps that still target the legacy Rhino runtime.
Admin roles to involve: Google Workspace super admin, Apps Script / automation owners, Developers
What administrators should do
Inventory Apps Script projects (bound scripts, add-ons, automations, web apps) still set to the legacy Rhino runtime and migrate them to the V8 runtime, updating any Rhino-only syntax. Rhino was deprecated on February 20, 2025; scripts left on it stop executing on January 31, 2026.
What happens if this is ignored
Scripts left on the Rhino runtime stop executing on January 31, 2026, breaking automations, add-ons, and web apps that depend on them.
Official source
Apps Script release notes (Rhino runtime deprecation)
Published by Google · Source dated 20 February 2025 · Checked 24 August 2026
Last verified 24 August 2026