Gemfile in ladder_drive-0.6.3 vs Gemfile in ladder_drive-0.6.4

@@ -1,15 +1,20 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in ladder_drive.gemspec
 gemspec
 
-gem "test-unit"
+group :test do
+  gem "test-unit"
+  gem "test-unit-rr"
+  #gem "test-unit-notify"
+end
 
-gem "activesupport", '~> 5.0'
+gem "activesupport", '>= 4.0'
 
 gem 'pi_piper', ">=  2.0.0"
 gem "ffi", "~> 1.9.24"
 
 gem 'serialport'
 gem 'google_drive'
 gem "ruby-trello"
+gem 'ambient_iot', ">= 0.1.1"