diff --git a/dm-serializer.gemspec b/dm-serializer.gemspec
index ef9d036..be6b0a7 100644
--- a/dm-serializer.gemspec
+++ b/dm-serializer.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |gem|
   gem.version       = DataMapper::Serializer::VERSION
 
   gem.add_runtime_dependency('dm-core',    '~> 1.3.0.beta')
-  gem.add_runtime_dependency('multi_json', '~> 1.3.2')
+  gem.add_runtime_dependency('multi_json', '>= 1.3.2')
   gem.add_runtime_dependency('fastercsv',  '~> 1.5.4')
 
   gem.add_development_dependency('rake',  '~> 0.9.2')