--- a/em-mongo.gemspec
+++ b/em-mongo.gemspec
@@ -26,5 +26,5 @@ Gem::Specification.new do |s|
   s.summary = 'An EventMachine driver for MongoDB.'
 
   s.add_dependency 'eventmachine', ['>=0.12.10', '< 2.0']
-  s.add_dependency 'bson',         ['>=1.9.2'  , '< 2.0']
+  s.add_dependency 'bson',         ['>=1.9.2']
 end