$ gem install --user-install multi_json -P LowSecurity
WARNING: You don't have /Users/mspoonauer/.gem/ruby/2.2.0/bin in your PATH,
gem executables will not run.
ERROR: While executing gem ... (Gem::Security::Exception)
certificate /CN=pavel/DC=pravosud/DC=com not valid after 2017-04-24 22:09:51 UTC
$ gem install --user-install multi_json -P NoSecurity
WARNING: You don't have /Users/mspoonauer/.gem/ruby/2.2.0/bin in your PATH,
gem executables will not run.
WARNING: email:pavel@pravosud.com is not trusted for multi_json-1.12.1
ERROR: While executing gem ... (Gem::Security::Exception)
missing digest for metadata.gz