You need to switch Centos' repos to Vault:
To do it:
1. Disable the vanilla Centos' repositories: cd /etc/yum.repos.d/
mv CentOS-Base.repo CentOS-Base.repo_orig
2. Create and open the file /etc/yum.repos.d/CentOS-Base.repo
using favorite text editor and put following content into the file:
[base]
name=CentOS-$releasever - Base
baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[updates]
name=CentOS-$releasever - Updates baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
gpgcheck=1gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
[extras]
name=CentOS-$releasever - Extras baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
3. Clean yum's cache
yum clean all
4. Update outdated binary packages to the latest version provided by repository Centos' valut repository yum update
Please note you do it your own risk.