If SimpleSAMLphp is your WAYF connector, here is an option for you to fetch metadata comprising WAYF's new certificate. And if the version of your SimpleSAMLphp is 1.7 or 1.8, the metadata renewal can be done now already.
New WAYF metadata corresponding to your particular version of SimpleSAMLphp (versions check) is available for download below (ZIP archive). The two current files are to be overwritten with the two files contained in the ZIP archive.
Place the files in the metadata directory of your SimpleSAMLphp installation: