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fMRIPrep has adopted cal-sem versioning. This can be broken down by the following example, X.Y.Z.e, where:
X = major version, signals year of the release. A release from 2020 will start with a 20. major version. Y = minor version, signals API breaking and/or output altering changes. Upgrading minor version will not be backwards compatible. Z = patch version, AKA bug fix releases. Patch versions will be backwards compatible with all minor version releases.