26.1 Pre-Release 1 (known as 26.1-pre-1 in the launcher) is the first pre-release for Java Edition 26.1, released on March 10, 2026, which updates the panorama and makes technical changes. This is the first pre-release released in 2026, and the first pre-release to be released with only an unobfuscated build. Full changelog: https://minecraft.wiki/Java_Edition_26.1-pre-1