diff --git a/puppet-openstack_infra_spec_helper.gemspec b/puppet-openstack_infra_spec_helper.gemspec
index 3161454..eef959e 100644
--- a/puppet-openstack_infra_spec_helper.gemspec
+++ b/puppet-openstack_infra_spec_helper.gemspec
@@ -68,6 +68,9 @@ Gem::Specification.new do |spec|
   # bundler 2.0 needs Ruby >= 2.3.0
   spec.add_dependency 'bundler', ['< 2.0.0']
 
+  # minitest 5.12.1 needs Ruby version >= 2.3, breaks centos-7 jobs
+  spec.add_dependency 'minitest', ['< 5.12.0']
+
   # dependencies that are needed to run beaker-rspec
   spec.add_dependency 'beaker-rspec'
   spec.add_dependency 'beaker-puppet_install_helper'