They are available for cPanel shared hosting services, you can select your php version through your cPanel as instructed in the link below:
http://secure.plusplushosting.net/knowledgebase/1090/Selecting-your-PHP-version-through-cPanel.html
Changelog:
5.5.13 --> http://www.php.net/ChangeLog-5.php#5.5.13
5.4.29 --> http://www.php.net/ChangeLog-5.php#5.4.29
- Saturday, June 7, 2014