如何运行特定版本的ruby gem

Question

I am running brakeman outside of my Gemfile, so am not using bundler.

If I do gem list , I can see I have the following for brakeman

brakeman (3.3.3, 3.3.2, 3.1.4, 3.1.2)

But if I do brakeman --version , I get

brakeman 3.1.2

so I am not using the latest version. If I do gem update brakeman or

gem update brakeman, '3.3.3,

I get

Updating installed gems
Nothing to update

So how do I run brakeman version 3.3.3?

Answer 1

If you have several gem versions installed and you want to invoke a specific version from the command-line, you could use:

brakeman _3.3.3_ [args go here]

This is not specific to brakeman, you can do this for most other gems as well.

Answer 2

I can't reproduce this issue, but I can think of a few reasons why this might happen:

• Bundler artifacts (perhaps in .bundle/ ) pointing to the old version. Try running in a different directory and see if it still happens
• A bug in RubyGems (try gem update --system )
• During install, it asked if you wanted to replace the brakeman binary and you selected "no"
• If you are using a Ruby version manager, maybe one version is on a different path than another (like a system gem versus one managed by rvm )
• Any number of GEM_PATH , bundler , gem , rvm weirdness that sometimes occurs

In any case, if I were you I'd gem uninstall brakeman , remove all versions, and install fresh. If you are using rvm , start with a fresh gemset or rvm gemset empty the current one.

Answer 3

I had a similar problem: I uninstalled a certain gem version, but the version still showed up.

TL;DR: rbenv rehash did the trick. (Only valid for rbenv users, obviously)