Yahoo! JAPAN Ads Script | Developer Center
日本語What is runtime
Runtime is the base for running Yahoo! JAPAN Ads Script.You can check the runtime version you are using in the "Runtime" section.

Yahoo! JAPAN Ads Script updates the runtime periodically to add and improve features.
Usually, scripts are automatically updated with the latest runtime.
Depending on the version update, the latest runtime may not be automatically applied, and scripts may run using the earlier runtime. In this case, you must manually update to the latest runtime. Learn more
Earlier runtimes will be unavailable after a certain time. At the same time, the automatic run of scripts using that runtime will also stop.