diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1800fec8..bb383a79 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,7 @@ Any violations of this scheme are considered to be bugs.
 
 * [#516](https://github.com/hashie/hashie/issues/516): Fixed `NoMethodError` raised when including `Hashie::Extensions::Mash::SymbolizeKeys` and `Hashie::Extensions::SymbolizeKeys` in mashes/hashes with non string or symbol keys - [@carolineartz](https://github.com/carolineartz).
 * [#531](https://github.com/hashie/hashie/pull/531): Fixed [slice doesn't work using symbols](https://github.com/hashie/hashie/issues/529) using hash with `IndifferentAccess` extension - [@gnomex](https://github.com/gnomex).
+* [#533](https://github.com/hashie/hashie/pull/533): Fixed `NoMethodError: undefined method `to_json'` at `hashie/dash_spec` - [@gnomex](https://github.com/gnomex).
 * Your contribution here.
 
 ### Security
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index b0f9ce99..0bdf972e 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -7,6 +7,7 @@
 
 require 'rspec'
 require 'hashie'
+require 'json'
 require 'rspec/pending_for'
 require './spec/support/ruby_version_check'
 require './spec/support/logger'