Posting around 26 Oct 2017 by kgh:
we are happy to announce the immediate availability of the sixt release to the Semantic MediaWiki 2.5 series.
Semantic MediaWiki 2.5.5 is a maintenance release providing several bugfixes and improvements. See the RELEASE-NOTES for the changes provided with this release. 
Thank you to all people involved making this release possible. We also encourage your continuous involvement .
- The SMW development team
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This wiki is currently using Semantic MediaWiki 2.4.6.