diff --git a/Gemfile b/Gemfile
index 43abf00..54911d2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,6 +5,11 @@ source 'https://rubygems.org'
 # Specify your gem's dependencies in youplot.gemspec
 gemspec
 
+group :development do
+  gem 'steep', require: false
+  gem 'typeprof'
+end
+
 group :test do
   gem 'rake'
   gem 'simplecov'