Gemfile in gelf-2.0.0 vs Gemfile in gelf-3.0.0

@@ -1,8 +1,11 @@
 source "https://rubygems.org"
 
 group :development do
   gem "shoulda", "~> 2.11.3"
-  gem "jeweler", "~> 1.8.7"
-  gem "mocha", "~> 0.14.0"
-  gem "test-unit", "~> 3.0.8"
+  gem "jeweler", "~> 2.1.1"
+  # Because of a dependency chain jeweler->github_api->oauth2->rack,
+  # pin the version: Rack 2.0.x doesn't work on < Ruby 2.2
+  gem 'rack', '< 2.0'
+  gem "mocha", "~> 1.1.0"
+  gem "test-unit", "~> 3.2.0"
 end