@mail2vij BigFix Fixlets are released based on the Erratas. They are not tied to any specific version of Red Hat. As such, if you just applied all the latest Fixlets in the site, then you may get moved up to the latest 5.x inadvertently.
However, if you pick and choose only those Erratas that were released up to the release date of a minor version, and then only apply the specific Kernel update and redhat-release package for the target minor version, it will be the same as a minor version upgrade.
For example, you could create a Baseline that included only those Fixlets that fit the criteria for the minor version upgrade and use that to upgrade your endpoints to the target minor release.