Read more: https://fedoraproject.org/wiki/Upgrading

yum install fedup
# To update to Fedora version 20 using network
fedup –network 20

If you encounter this error message: Downloading failed: could not verify GPG signature: No public key, run:

yum update fedora-release

or you can ignore GPG completely using

sudo fedup –network 20 –nogpgcheck
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