It's a decision by the Wikimedia Foundation that they're applying to their own projects. So Wikipedia, Wiktionary, etc.[1] MediaWiki 1.38 and later bundles Vec

It's a decision by the Wikimedia Foundation that they're applying to their own projects. So Wikipedia, Wiktionary, etc.[1] MediaWiki 1.38 and later bundles Vector 2022, the prior 2011 version of Vector, the pre-2011 default MonoBook, the responsive alternative Timeless, and the mobile-only skin Minerva.[2] MediaWiki admins can still set whatever skin they want to use in LocalSettings.php. $wgDefaultSkin is still vector, the 2011 version, as it has been since 1.18.[3] 1: https://wikimediafoundation.org/our-work/wikimedia-projects/ https://wikimediafoundation.org/our-work/wikimedia-projects/ 2: https://www.mediawiki.org/wiki/Bundled_extensions_and_skins https://www.mediawiki.org/wiki/Bundled_extensions_and_skins 3: https://www.mediawiki.org/wiki/Manual:$wgDefaultSkin https://www.mediawiki.org/wiki/Manual:$wgDefaultSkin