diff --git a/Gemfile b/Gemfile
index 630c9ff..9eeb3a9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,11 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
-# Specify your gem's dependencies in knuckle_cluster.gemspec
 gemspec
+
+group :development do
+  gem 'pry'
+  gem 'rake', '~> 13.0'
+  gem 'rspec', '~> 3.0'
+end
diff --git a/knuckle_cluster.gemspec b/knuckle_cluster.gemspec
index 595dd23..35f4642 100644
--- a/knuckle_cluster.gemspec
+++ b/knuckle_cluster.gemspec
@@ -19,10 +19,6 @@ Gem::Specification.new do |spec|
   end
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "rake",    "~> 10.0"
-  spec.add_development_dependency "rspec",   "~> 3.0"
-  spec.add_development_dependency "pry",     "~> 0.11"
-
   spec.add_dependency 'aws-sdk-core',        '~> 3'
   spec.add_dependency 'aws-sdk-ec2',         '~> 1'
   spec.add_dependency 'aws-sdk-ecs',         '~> 1'