diff --git a/lib/ruby-prolog/version.rb b/lib/ruby-prolog/version.rb
index b1ee010..c75accc 100644
--- a/lib/ruby-prolog/version.rb
+++ b/lib/ruby-prolog/version.rb
@@ -1,5 +1,5 @@
 module RubyProlog
 
-	VERSION = '2.1.0'
+	VERSION = '2.2.0'
 
 end
\ No newline at end of file