diff --git a/lib/vagrant-zones/version.rb b/lib/vagrant-zones/version.rb
index 95f17d5..c53d94d 100644
--- a/lib/vagrant-zones/version.rb
+++ b/lib/vagrant-zones/version.rb
@@ -1,5 +1,5 @@
 module VagrantPlugins
   module ProviderZone
-    VERSION = "0.1.56"
+    VERSION = '0.1.56'.freeze
   end
 end