Gemfile in contentful_middleman-3.0.1 vs Gemfile in contentful_middleman-4.0.0

@@ -1,9 +1,10 @@
 # If you have OpenSSL installed, we recommend updating
 # the following line to use "https"
 source 'http://rubygems.org'
 
-gem "middleman-core", '~> 3.4'
+gem "middleman-core", '~> 4.0'
+gem "middleman-cli", '~> 4.0'
 
 # Specify your gem's dependencies in contentful_middleman.gemspec
 gemspec
 
 gem "yard"