Gemfile in envault-0.1.1 vs Gemfile in envault-0.1.2

@@ -1,7 +1,12 @@
 source 'https://rubygems.org'
 
 gemspec
 
+if Gem::Version.create(RUBY_VERSION) < Gem::Version.create("2.2.2")
+  # NOTE: activesupport 5.x supports only ruby 2.2.2+
+  gem "activesupport", ">= 4.0.0", "< 5.0.0"
+end
+
 group :development do
   gem 'kramdown'
 end