Try to update RHEL 6.5 release to 6.10

Hi all,

i'm using a RHEL 6.5 vm server.
I would like to update it to 6.10 version.
My server is correctly subscribed.
After a big "sudo yum update -y" (about 400 Mo) & reboot, i found 2 "problems" :
- /etc/redhat-release is still with "Red Hat Enterprise Linux Server release 6.5 (Santiago)"
- on redHat customer's portal, my server is displayed with : 45 security failures & 12 bugs. How can i update my server with thoses patchs ?

Moreover :
$ uname -a
Linux vulcain 2.6.32-696.3.2.el6.x86_64 #1 SMP Wed Jun 7 11:51:39 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux

Last week, i've performed same steps to update another server, and after a reboot, it was successfully update to 6.10 release.

Best regards