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Unable to download data from https:/rubygems.org

when I stall Ruby DevKit by following https://github.com/oneclick/rubyinstaller/wiki/Development-Kit

C:\DevKit>gem install json --platform=ruby

ERROR: Could not find a valid gem 'json' (>= 0), here is why: Unable to download data from https://rubygems.org/ - SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (https://api.rubygems.org/specs.4.8.gz)

How do deal with this problem?

Unable to download data from https:/rubygems.org

when I stall Ruby DevKit by following https://github.com/oneclick/rubyinstaller/wiki/Development-Kit

C:\DevKit>gem install json --platform=ruby

ERROR: Could not find a valid gem 'json' (>= 0), here is why: Unable to download data from https://rubygems.org/ - SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (https://api.rubygems.org/specs.4.8.gz)

How do deal with this problem?