CSL versions not up-to-date

I work for a government agency and we created our own citation style for our own purposes. I created a copy of our CSL file and edited this copy to incorporate a couple of changes requested by others within the agency. When I added this style onto Zotero to test, I notice that this message appeared:

"[My style file path] is not a valid CSL 1.0.2 style file, and may not work properly with Zotero."

How do I update the CSL version of this style file?
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