diff --git a/lib/right_agent/serialize/serializable.rb b/lib/right_agent/serialize/serializable.rb
index <HASH>..<HASH> 100644
--- a/lib/right_agent/serialize/serializable.rb
+++ b/lib/right_agent/serialize/serializable.rb
@@ -30,9 +30,9 @@ module RightScale
 
     def self.included(base)
       if @check_active_support
-        if require_succeeds?("active_support") && (v = Gem.loaded_specs['activesupport'].version.to_s) != "2.3.5"
+        if require_succeeds?("active_support") && (v = Gem.loaded_specs['activesupport'].version.to_s) != "2.3.18"
           raise Exception.new("Some versions of the activesupport gem modify json in ways that are incompatible with this " +
-                              "RightScale::Serializable module. Version #{v} used here is not allowed, use 2.3.5 instead.")
+                              "RightScale::Serializable module. Version #{v} used here is not allowed, use 2.3.18 instead.")
         else
           @check_active_support = false
         end
CM-<I> Upgrade Rails to <I>