Migrating from struts2.3 to struts2.5

I was trying to migrate my app which is already in struts2-2.3.35 to struts2-2.5.26 but i couldn’t find jars other then struts2-core like struts2-convention-plugin,struts2-json-plugin,struts2-tiles-plugin, with same version which is 2.5.26.
how can i ask nexus team to add jars with same version

You need to talk to the people running your Nexus server.