diff --git a/Rakefile b/Rakefile
index 8e83178..aa77d84 100644
--- a/Rakefile
+++ b/Rakefile
@@ -5,7 +5,7 @@ PROTOTYPE_ROOT     = File.expand_path(File.dirname(__FILE__))
 PROTOTYPE_SRC_DIR  = File.join(PROTOTYPE_ROOT, 'src')
 PROTOTYPE_DIST_DIR = File.join(PROTOTYPE_ROOT, 'dist')
 PROTOTYPE_PKG_DIR  = File.join(PROTOTYPE_ROOT, 'pkg')
-PROTOTYPE_VERSION  = '1.5.2_pre0'
+PROTOTYPE_VERSION  = '1.6.0_pre1'
 
 task :default => [:dist, :package, :clean_package_source]