2 files changed, 16 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/big_decimal/conversions.rb b/activesupport/lib/active_support/core_ext/big_decimal/conversions.rb
index a279849829..11c318c244 100644
--- a/activesupport/lib/active_support/core_ext/big_decimal/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/big_decimal/conversions.rb
@@ -1,4 +1,10 @@
 require 'bigdecimal'
+
+begin
+  require 'psych'
+rescue LoadError
+end
+
 require 'yaml'
 
 class BigDecimal
diff --git a/activesupport/lib/active_support/time_with_zone.rb b/activesupport/lib/active_support/time_with_zone.rb
index 8137f8e17e..3da216ac78 100644
--- a/activesupport/lib/active_support/time_with_zone.rb
+++ b/activesupport/lib/active_support/time_with_zone.rb
@@ -137,7 +137,17 @@ module ActiveSupport
       end
     end
 
+    def encode_with(coder)
+      if coder.respond_to?(:represent_object)
+        coder.represent_object(nil, utc)
+      else
+        coder.represent_scalar(nil, utc.strftime("%Y-%m-%d %H:%M:%S.%9NZ"))
+      end
+    end
+
     def to_yaml(options = {})
+      return super if defined?(YAML::ENGINE) && !YAML::ENGINE.syck?
+
       utc.to_yaml(options)
     end