title: yum update gives 'Obsoleted by ...' error
body: <p>My OS is <code>CentOS 6.9</code>, and I'm trying to upgrade mysql 5.5 to 5.7 with this link: <a href="https://support.plesk.com/hc/en-us/articles/213403429-How-to-upgrade-MySQL-5-5-to-5-6-5-7-or-MariaDB-5-5-to-10-0-10-1-10-2-on-Linux" rel="nofollow noreferrer">https://support.plesk.com/hc/en-us/articles/213403429-How-to-upgrade-MySQL-5-5-to-5-6-5-7-or-MariaDB-5-5-to-10-0-10-1-10-2-on-Linux</a></p>
  
  <p>But <code># yum update mysql</code> gives me errors : </p>
  
  <pre><code>Error: Package: php-mysql-5.4.45-14.el6.remi.x86_64 (@remi)
             Requires: libmysqlclient.so.18()(64bit)
             Removing: mysql-libs-5.5.59-1.el6.remi.x86_64 (@remi)
                 libmysqlclient.so.18()(64bit)
             Obsoleted By: mysql-community-libs-5.7.21-1.el6.x86_64 (mysql57-community)
                 Not found
  Error: Package: php-mysql-5.4.45-14.el6.remi.x86_64 (@remi)
             Requires: libmysqlclient.so.18(libmysqlclient_18)(64bit)
             Removing: mysql-libs-5.5.59-1.el6.remi.x86_64 (@remi)
                 libmysqlclient.so.18(libmysqlclient_18)(64bit)
             Obsoleted By: mysql-community-libs-5.7.21-1.el6.x86_64 (mysql57-community)
                 Not found
  Error: Package: php-mysql-5.4.45-14.el6.remi.x86_64 (@remi)
             Requires: libmysqlclient.so.18(libmysqlclient_16)(64bit)
             Removing: mysql-libs-5.5.59-1.el6.remi.x86_64 (@remi)
                 libmysqlclient.so.18(libmysqlclient_16)(64bit)
             Obsoleted By: mysql-community-libs-5.7.21-1.el6.x86_64 (mysql57-community)
                 Not found
  </code></pre>
  
  <p>I tried <code>yum clean metadata</code> and <code>yum clean all</code> several times but it's not working.
  Please help me.</p>