Git 3.0's SHA-256 default is a costly mistake, says Chacon

Scott Chacon says Git's plan to make SHA-256 the default hash for new repositories in version 3.0 will be a costly mistake. His argument, published on the GitButler blog on September 30, 2026, lands as the Git project itself says the switch will wait until the wider ecosystem is ready. The dispute matters because every tool that stores or parses a Git commit ID is affected by the answer. Tech AI Wire covered the Git 3.0 plan in September. New repositories get SHA-256 object names, the reftable format and a main branch, and building Git will require Rust.