We've just completed a maintenance release for Infinispan 5.1.x branch. Besides other fixes, this release contains a critical fix for Hibernate integration, i.e. using Infinispan as a 2nd level cache in Hibernate ( a big thanks to Sanne Grinovero for looking into this).
You can download the distribution or the maven artifact. If you have any questions please check our forums, our mailing lists or ping us directly on IRC!