diff --git a/Library/Homebrew/test/Rakefile b/Library/Homebrew/test/Rakefile
index ea61abef8a..1f919aab28 100644
--- a/Library/Homebrew/test/Rakefile
+++ b/Library/Homebrew/test/Rakefile
@@ -3,15 +3,19 @@ require 'rake/testtask'
 
 TEST_DIRECTORY = File.dirname(File.expand_path(__FILE__))
 TEST_FILES = Dir["#{TEST_DIRECTORY}/test_*.rb"]
-GEM_DEPS = %w[mocha minitest]
+GEM_DEPS = {
+  "mocha" => "~> 1.1",
+  "minitest" => "~> 5.3",
+  "rake" => "~> 10.3",
+}
 
 task :default => :test
 
 task :deps do
-  GEM_DEPS.each do |dep|
-    `gem list --installed #{dep}`
+  GEM_DEPS.each do |dep, version|
+    `gem list --installed #{dep} -v '#{version}'`
     next if $?.success?
-    sh 'gem', 'install', '--no-ri', '--no-rdoc', '--user-install', dep
+    sh "gem", "install", "--no-ri", "--no-rdoc", "--user-install", dep, "-v", version
   end
 end