diff --git a/lib/kml/container.rb b/lib/kml/container.rb
index 5c914de..927d68c 100644
--- a/lib/kml/container.rb
+++ b/lib/kml/container.rb
@@ -1,11 +1,11 @@
 module KML
   # A Container is an abstract base class that holds one or more Features and allows the creation of nested hierarchies.
   class Container < Feature
-    
+
     # Access the features in the container
     attr_accessor :features
     attr_accessor :plain_children
-    
+
     # Get the features in the container
     def features
       @features ||= []
diff --git a/lib/kml_file.rb b/lib/kml_file.rb
index 0e2796f..a2d7dc5 100644
--- a/lib/kml_file.rb
+++ b/lib/kml_file.rb
@@ -19,7 +19,12 @@ def objects
   # Render the KML file
   def render(xm=Builder::XmlMarkup.new(:indent => 2))
     xm.instruct!
-    xm.kml(:xmlns => 'http://earth.google.com/kml/2.1'){
+    xmlnses = {}
+    xmlnses["xmlns".to_sym] = "http://www.opengis.net/kml/2.2"
+    xmlnses["xmlns:gx".to_sym] = "http://www.google.com/kml/ext/2.2"
+    xmlnses["xmlns:kml".to_sym] = "http://www.opengis.net/kml/2.2"
+    xmlnses["xmlns:atom".to_sym] = "http://www.w3.org/2005/Atom"
+    xm.kml(**xmlnses) {
       objects.each { |o| o.render(xm) }
     }
   end
diff --git a/lib/ruby_kml.rb b/lib/ruby_kml.rb
index 3af0e55..3c0c46a 100644
--- a/lib/ruby_kml.rb
+++ b/lib/ruby_kml.rb
@@ -1,4 +1,3 @@
-require 'rubygems'
 require 'builder'
 
 require 'kml_file'
diff --git a/ruby_kml.gemspec b/ruby_kml.gemspec
index e1ab6ba..6a53aaa 100644
--- a/ruby_kml.gemspec
+++ b/ruby_kml.gemspec
@@ -9,4 +9,6 @@ Gem::Specification.new do |s|
   s.has_rdoc  = false
   s.authors   = ["aeden, schleyfox, xaviershay, andykram, IanVaughan"]
   s.files     = Dir['**/**']
+
+  s.add_runtime_dependency "builder"
 end