--- mail.gemspec.orig	2016-03-31 16:04:29 UTC
+++ mail.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
 
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
       s.add_runtime_dependency(%q<mime-types>.freeze, ["~> 1.16"])
-      s.add_runtime_dependency(%q<treetop>.freeze, ["~> 1.4.8"])
+      s.add_runtime_dependency(%q<treetop>.freeze, [">= 1.4.8"])
       s.add_development_dependency(%q<bundler>.freeze, [">= 1.0.3"])
       s.add_development_dependency(%q<rake>.freeze, ["> 0.8.7"])
       s.add_development_dependency(%q<rspec>.freeze, ["~> 2.12.0"])