diff --git a/money.gemspec b/money.gemspec
index 127dda923c..abbfdc470e 100644
--- a/money.gemspec
+++ b/money.gemspec
@@ -12,8 +12,8 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = ">= 1.3.6"
 
-  s.add_dependency "i18n", "~> 0.4"
-  s.add_dependency "multi_json"
+  s.add_dependency "i18n",       "~> 0.4"
+  s.add_dependency "multi_json", "~> 1.3"
 
   s.add_development_dependency "rspec",       "~> 2.9.0"
   s.add_development_dependency "yard",        "~> 0.7.5"
@@ -23,8 +23,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency "guard-spork", "~> 0.6.1"
   s.add_development_dependency "guard-rspec", "~> 0.7.0"
 
-  s.requirements << "multi_json"
-
   s.files =  Dir.glob("{config,lib,spec}/**/*")
   s.files += %w(CHANGELOG.md LICENSE README.md)
   s.files += %w(Rakefile .gemtest money.gemspec)