Gemfile in escalator-0.2.2 vs Gemfile in escalator-0.2.3

@@ -2,8 +2,7 @@
 
 # Specify your gem's dependencies in escalator.gemspec
 gemspec
 
 gem "test-unit"
-gem "activesupport"
-gem "webrick"
-gem "curses"
+
+gem "activesupport", ">=4.2.7"