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Why does uname report the previous version after an upgrade?

I just upgraded from fc27 to fc28 using the procedure listed at: https://fedoramagazine.org/upgrading-fedora-27-fedora-28/.

Before the upgrade uname a gave me this:

Linux epoch 4.15.3-300.fc27.i686 #1 SMP Tue Feb 13 17:36:43 UTC 2018 i686 i686 i386 GNU/Linux

after the upgrade, I get this:

Linux epoch 4.16.15-200.fc27.i686 #1 SMP Fri Apr 27 19:53:46 UTC 2018 i686 i686 i386 GNU/Linux

The kernel changed from 4.15 to 4.16, but the Fedora version stayed at fc27.

Why doesn't the Fedora version change? I was expecting to see fc28.

Why does uname report the previous version after an upgrade?

I just upgraded from fc27 to fc28 using the procedure listed at: https://fedoramagazine.org/upgrading-fedora-27-fedora-28/.

Before the upgrade uname a -a gave me this:

Linux epoch 4.15.3-300.fc27.i686 #1 SMP Tue Feb 13 17:36:43 UTC 2018 i686 i686 i386 GNU/Linux

after the upgrade, I get this:

Linux epoch 4.16.15-200.fc27.i686 4.16.5-200.fc27.i686 #1 SMP Fri Apr 27 19:53:46 UTC 2018 i686 i686 i386 GNU/Linux

The kernel changed from 4.15 to 4.16, but the Fedora version stayed at fc27.

Why doesn't the Fedora version change? I was expecting to see fc28.

The output from rpm -q kernel:

$ rpm -q kernel
kernel-4.17.0-0.rc2.git0.1.vanilla.knurd.1.fc27.i686
kernel-4.16.5-200.fc27.i686
kernel-4.16.5-300.fc28.i686