diff --git a/Gemfile b/Gemfile
index 7a34cb7..9e1126f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -24,8 +24,3 @@ platforms :ruby do
   gem "mysql2", "~> 0.3.11"
   gem "pg"
 end
-
-if RUBY_VERSION < '2'
-  gem 'json', '~> 1.8'
-  gem 'tins', '1.6.0', require: false
-end
diff --git a/groupify.gemspec b/groupify.gemspec
index 2009e9a..3ceba83 100644
--- a/groupify.gemspec
+++ b/groupify.gemspec
@@ -18,6 +18,11 @@ Gem::Specification.new do |gem|
 
   gem.required_ruby_version = ">= 1.9.3"
 
+  if RUBY_VERSION < '2'
+    gem 'json', '~> 1.8'
+    gem 'tins', '1.6.0', require: false
+  end
+
   gem.add_development_dependency "mongoid", ">= 3.1"
   gem.add_development_dependency "activerecord", ">= 3.2", "< 5.1"