20.0.0rc3 _fMRIPrep_ is transitioning to a calendar version system [#1912](https://github.com/poldracklab/fmriprep/issues/1912). The [CalVer](https://calver.org/) system reflects _fMRIPrep_'s nature as an evolving workflow and does not impose any artificial incentive for "big-change" releases. It also permits to quickly see how out-of-date someone's version is. As of now, the *default* version increment is the minor release number. Hence, when the minor release number changes the work directory of _fMRIPrep_ will presumably break. Micro releases only include bug-fixes that can reuse exiting working directories. The major highlight of this release entails CIFTI generation to match HCP (Human Connectome Project) _grayordinates_. In addition, the new _fMRIPrep 20.0.0_ has gone through a major overhaul in the handling of standard spaces (spatial normalizations, fusion of prior knowledge from corresponding atlases) and imaging outputs. In particular, the new series almost completely implements the new syntax for `--output-spaces` to describe the (non)standard spatial references that shall be used for generating outputs [#1604](https://github.com/poldracklab/fmriprep/issues/1604). This release includes contributions from Azeez Adebimpe and Basile Pinsard - very much appreciated. * ENH: Warn when existing output version does not match current pipeline version (#1967) * ENH: Add ``--clean-workdir`` argument (#1966) * ENH: Refactor of how spatial normalization targets and ``--output-spaces`` are maintained (#1955) (#1983) * ENH: Add ``--bids-filter-file`` argument for more controlled data querying (#1770) * FIX: Ensure subject ID is used when selecting BIDS data (#1982) * FIX: Display a log message when processing completes successfully (#1977) * DOC: Clean up surface outputs (#1993) * DOC: Integrate intersphinx, drop external module wrapping (#1989) * DOC: Improve custom template usage description (#1969) * MAINT: Use local docker registry (#1990) * MAINT: Pin connectome-workbench 1.3.2, add to documented dependencies (#1958) * MAINT: Pin NiBabel, NiWorkflows, sMRIPrep (#1971) * MAINT: CI build error fixes (#1976)