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Minecraft 26.3 is now supported. Download shapeboard-1.7.1+26.3.jar and use Java 25, Fabric Loader 0.19.5 or newer, and Fabric API for 26.3.
Existing shapes and totals are retained when updating the same world. Stop the server cleanly, back up the world, replace the old ShapeBoard jar and update Fabric as needed. Keep the world's shapeboard/ folder and vanilla scoreboard data. There is no need to recreate shapes or rescan them to resume counting.
The volume scanner now reads Minecraft 26.3's string and id block palettes as well as older Name palettes. This fixes scans reporting zero remaining blocks after a world upgrade. The English and Spanish READMEs include the compatibility table and update instructions.
Validation: all 14 supported jars compile. A local Fabric 26.2 world using ShapeBoard 1.7.0 was upgraded to Fabric 26.3 with ShapeBoard 1.7.1. Four shapes across two dimensions, 18 individual break/placement scores, baselines, scan snapshots and player preferences were retained; 40 command responses matched. A fresh scan counted the expected 300 blocks, including a mixed palette with 190 stone, 100 diamond ore and 10 stairs, and a second restart retained the data. The placement mixin was also verified in the runtime-transformed BlockItem class.
Earlier Minecraft versions remain supported, from 1.21 through 26.2. Choose the jar whose filename matches your Minecraft version; the +1.21 jar also covers 1.21.1 and +26.1.2 also covers 26.1 and 26.1.1.