Do not free by default

lib/liquid/environment.rb

@@ -46,7 +46,7 @@ module Liquid
         ret.error_mode = error_mode if error_mode
         ret.exception_renderer = exception_renderer if exception_renderer
         yield ret if block_given?
-        ret.freeze
+        # ret.freeze
       end
 
       # Returns the default environment instance.

lib/liquid/version.rb

@@ -2,5 +2,5 @@
 # frozen_string_literal: true
 
 module Liquid
-  VERSION = "5.6.0.alpha"
+  VERSION = "5.5.2.alpha"
 end