I tried updating it via tlmgr but it has the latest available:
shortdesc: Bibliography formatting with Citation Style Language
longdesc: The Citation Style Language (CSL) is an XML-based language that defines the formats of citations and bibliography. There are currently thousands of styles in CSL including the most widely used APA, Chicago, Vancouver, etc. The citation-style-language package is aimed to provide another reference formatting method for LaTeX that utilizes the CSL styles. It contains a citation processor implemented in pure Lua (citeproc-lua) which reads bibliographic metadata and performs sorting and formatting on both citations and bibliography according to the selected CSL style. A LaTeX package (citation-style-language.sty) is provided to communicate with the processor.
sizes: doc: 273k, run: 2093k, bin: 5k
cat-license: mit cc-by-sa-3
cat-topics: biblio use-lua
cat-contact-repository: GitHub - zepinglee/citeproc-lua: A Lua implementation of the Citation Style Language (CSL)