how to update watir?

i am getting error while truing to install watir

C:>gem install watir ERROR: http://rubygems.org/ does not appear to be a repository ERROR: Could not find a valid gem 'watir' (>= 0) in any repository

C:>g开发者_JAVA技巧em -v 1.3.7

C:>ruby -v ruby 1.9.1p378 (2010-01-10 revision 26273) [i386-mingw32]

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Try

gem sources -a http://gems.github.com

and then

gem install watir

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One line solution (since I can't vote yet):

gem install watir --source http://gems.github.com

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That looks like a proxy problem. Use http_proxy environment variable to setup a tunnel, or download the gems manually from rubygems.

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I found this post useful in setting the http_proxy value and then installing.

How do I update Ruby Gems from behind a Proxy (ISA-NTLM)

Looks like this is an old post - but there was nothing marked as the answer :)