diff --git a/postmark.gemspec b/postmark.gemspec
index 97baea5..e92bc41 100644
--- a/postmark.gemspec
+++ b/postmark.gemspec
@@ -33,8 +33,8 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = ">= 1.3.7"
 
-  s.add_dependency "rake"
   s.add_dependency "json"
 
   s.add_development_dependency "mail"
+  s.add_development_dependency "rake"
 end