When you exeucte gem command, you may see SSL error like bellow.

SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

This error is produced because of changes in rubygems.org infrastructure.

How to solve it?

1. Downlaod update package

Download update package from bellow link.

Download : rubygems-update-2.6.7.gem

2. Update RubyGems using Command Prompt

Execute Command Prompt and go to download folder. (ex. C:)

And execute bellow command.

C:\>gem install --local C:\rubygems-update-2.6.7.gem
C:\>update_rubygems --no-ri --no-rdoc

After this, execute gem --version to check new version of RubyGems.

3. Uninstall rubygems-update gem

You can uninstall rubygems-update gem.

C:\>gem uninstall rubygems-update -x
Removing update_rubygems
Successfully uninstalled rubygems-update-2.6.7

Reference

• http://guides.rubygems.org/ssl-certificate-update