diff --git a/Gemfile b/Gemfile
index 34df138ac..85ca0406b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,5 +2,4 @@ source 'https://rubygems.org'
 
 gemspec name: 'mutant'
 
-gem 'devtools', git: 'https://github.com/rom-rb/devtools.git'
 eval_gemfile File.expand_path('../Gemfile.shared', __FILE__)
diff --git a/mutant.gemspec b/mutant.gemspec
index 7146e8e67..d7901ea9e 100644
--- a/mutant.gemspec
+++ b/mutant.gemspec
@@ -36,6 +36,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency('anima',         '~> 0.3.0')
   gem.add_runtime_dependency('concord',       '~> 0.1.5')
 
-  gem.add_development_dependency('bundler', '~> 1.3', '>= 1.3.5')
-  gem.add_development_dependency('ffi',     '~> 1.9.6')
+  gem.add_development_dependency('devtools', '~> 0.1.1')
+  gem.add_development_dependency('bundler',  '~> 1.10')
+  gem.add_development_dependency('ffi',      '~> 1.9.6')
 end