Please rebuilt the latest version of this package for EL7, the current EL7 package is still affected by #1072246
rubygem-mizuho-0.9.20-4.el7 has been submitted as an update for Fedora EPEL 7. https://admin.fedoraproject.org/updates/rubygem-mizuho-0.9.20-4.el7
Package rubygem-mizuho-0.9.20-4.el7: * should fix your issue, * was pushed to the Fedora EPEL 7 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=epel-testing rubygem-mizuho-0.9.20-4.el7' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-EPEL-2015-0350/rubygem-mizuho-0.9.20-4.el7 then log in and leave karma (feedback).
rubygem-mizuho-0.9.20-4.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.