  The Universal Morphology (UniMorph) project is a collaborative effort
providing broad-coverage instantiated normalized morphological inflection
tables for hundreds of diverse world languages. The project comprises two major
thrusts: a language-independent feature schema for rich morphological
annotation and a type-level resource of annotated data in diverse languages
realizing that schema. This paper presents the expansions and improvements made
on several fronts over the last couple of years (since McCarthy et al. (2020)).
Collaborative efforts by numerous linguists have added 67 new languages,
including 30 endangered languages. We have implemented several improvements to
the extraction pipeline to tackle some issues, e.g. missing gender and macron
information. We have also amended the schema to use a hierarchical structure
that is needed for morphological phenomena like multiple-argument agreement and
case stacking, while adding some missing morphological features to make the
schema more inclusive. In light of the last UniMorph release, we also augmented
the database with morpheme segmentation for 16 languages. Lastly, this new
release makes a push towards inclusion of derivational morphology in UniMorph
by enriching the data and annotation schema with instances representing
derivational processes from MorphyNet.
