diff --git a/Gemfile b/Gemfile
index 2801ba8..7f4f5e9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,3 @@
 source 'https://rubygems.org'
 
 gemspec
-
-gem 'akami', '~> 1.3.2'
-gem 'nokogiri', '~> 1.15.6'
-gem 'wasabi', '>= 3.7'
diff --git a/gemfiles/rails_4.gemfile b/gemfiles/rails_4.gemfile
index 59f1723..f43174f 100644
--- a/gemfiles/rails_4.gemfile
+++ b/gemfiles/rails_4.gemfile
@@ -2,9 +2,6 @@
 
 source "https://rubygems.org"
 
-gem "akami", "~> 1.3.2"
-gem "nokogiri", "~> 1.15.6"
-gem "wasabi", ">= 3.7"
 gem "activemodel", "~> 4.2.11"
 gem "bigdecimal", "~> 1.4"
 
diff --git a/zuora.gemspec b/zuora.gemspec
index ebf4268..f3949c2 100644
--- a/zuora.gemspec
+++ b/zuora.gemspec
@@ -20,24 +20,30 @@ Gem::Specification.new do |s|
   s.test_files  = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.extra_rdoc_files = ['README.md']
 
-  s.add_dependency 'activemodel', '>= 4.2.11'
-  # s.add_dependency 'activesupport', '>= 4.2.11'
-  # s.add_dependency 'httpi', '~> 4.0.2'
-  s.add_dependency 'i18n', '~> 0.7'
-  s.add_dependency 'libxml4r', '~> 0.2.6'
-  s.add_dependency 'savon', '~> 2.15.0'
   s.add_development_dependency 'appraisal'
+
   s.add_development_dependency 'artifice', '~> 0.6.0'
-  # s.add_development_dependency 'bigdecimal'#, '~> 3.0.0'
-  s.add_development_dependency 'factory_bot'#, '~> 4.9.0'
+  # s.add_development_dependency 'bigdecimal', '< 2.0.0'
+  s.add_development_dependency 'factory_bot'#, '~> 2.6.4'
   s.add_development_dependency 'guard-rspec', '~> 0.6.0'
-  s.add_development_dependency 'pry-nav'
   s.add_development_dependency 'pry'
+  s.add_development_dependency 'pry-nav'
   s.add_development_dependency 'rake', '~> 13.0'
   s.add_development_dependency 'redcarpet', '~> 2.1.0'
   s.add_development_dependency 'rspec', '~> 3.0'
-  s.add_development_dependency 'simplecov', '~> 0.22.0'
-  s.add_development_dependency 'sqlite3', '~> 1.3'
+  s.add_development_dependency 'simplecov', '~> 0.6.4'
+  s.add_development_dependency 'sqlite3', '~> 1.3.0'
   s.add_development_dependency 'test-unit'
   s.add_development_dependency 'yard', '~> 0.7.5'
+
+  s.add_dependency 'activemodel', '< 5.0.0'
+ # s.add_dependency 'activesupport', '< 5.0.0'
+  s.add_dependency 'httpi', '~> 3.0'
+  s.add_dependency 'rack', '< 3.0'
+  s.add_dependency 'libxml4r', '~> 0.2.6'
+  s.add_dependency 'savon', '~> 2.0'
+
+  s.add_dependency 'akami', '~> 1.3.2'
+  s.add_dependency 'nokogiri', '~> 1.15.6'
+  s.add_dependency 'wasabi', '~> 3.0'
 end