The Yoast SEO plugin in WordPress has started advising users to upgrade curl to the latest version. On CentoOS this can be done easily using the city-fan.org repo here:
http://www.city-fan.org/ftp/contrib/yum-repo/
For a CentOS 6 server, here are the steps:
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rpm -Uvh http://www.city-fan.org/ftp/contrib/yum-repo/city-fan.org-release-1-13.rhel6.noarch.rpm yum install libcurl |