This update should be compatible with worlds that were using Dimensions version 0.5, as long as you also upgrade the world to Minecraft 1.21.4, however some custom items added by New in Town Dimensions may lose their textures if you're using the Optional Resources, due to changes to Custom Model Data. As always, a backup is still recommended.

General:

• Updated to Pack Format 61 for Minecraft 1.21.4.
• Updated Custom Model Data components of all items to 1.21.4 format