Title: Outdated API Version
Last modified: April 24, 2026

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# Outdated API Version

 *  [jschuoler](https://wordpress.org/support/users/jschuoler/)
 * (@jschuoler)
 * [1 month, 2 weeks ago](https://wordpress.org/support/topic/outdated-api-version-2/)
 * Gutenberg blocks (‘source’ and ‘content’) are currently registered with API version
   1. This forces my entire WordPress editor to fall back to the legacy non-iframe
   mode. Can you please update your blocks to `apiVersion: 3` so they are compatible
   with modern Gutenberg iframes?

Viewing 1 replies (of 1 total)

 *  Plugin Author [Carolina](https://wordpress.org/support/users/carolinaop/)
 * (@carolinaop)
 * [1 month, 1 week ago](https://wordpress.org/support/topic/outdated-api-version-2/#post-18893557)
 * Hello [@jschuoler](https://wordpress.org/support/users/jschuoler/)
 * Thank you for bringing this to our attention!
 * Our plugin’s blocks don’t declare an API version, so WordPress treats them as
   API v1 (the legacy default), which causes the editor to disable iframe mode for
   the whole post.
 * We’ll review this on our end and update the blocks to explicitly use a newer 
   API version.
 * We’ll keep you posted as soon as we have an update.
 * Thanks again for reporting this!

Viewing 1 replies (of 1 total)

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## Tags

 * [api](https://wordpress.org/support/topic-tag/api/)

 * 1 reply
 * 2 participants
 * Last reply from: [Carolina](https://wordpress.org/support/users/carolinaop/)
 * Last activity: [1 month, 1 week ago](https://wordpress.org/support/topic/outdated-api-version-2/#post-18893557)
 * Status: not a support question