diff --git a/fog-aws.gemspec b/fog-aws.gemspec
index 5bb511b92..4f596f257 100644
--- a/fog-aws.gemspec
+++ b/fog-aws.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubyzip', '~> 2.4.1'
   spec.add_development_dependency 'shindo',  '~> 0.3'
 
-  spec.add_dependency 'base64', '~> 0.2.0'
+  spec.add_dependency 'base64', '>= 0.2', '< 0.4'
   spec.add_dependency 'fog-core', '~> 2.6'
   spec.add_dependency 'fog-json', '~> 1.1'
   spec.add_dependency 'fog-xml', '~> 0.1'