It is currently

<version.org.eclipse.microprofile>6.0</version.org.eclipse.microprofile>

I don't know how important this is, since the only use I see of it is in testsuite/integration/microprofile-tck/certification/pom.xml. So I presume this is to certify the whole platform which we are not doing at the moment.

Still it doesn't hurt to keep this version up to date