write_xlsx.gemspec in write_xlsx-0.72.0 vs write_xlsx.gemspec in write_xlsx-0.72.1

@@ -20,9 +20,8 @@
   gem.extra_rdoc_files = [
     "LICENSE.txt",
     "README.rdoc"
   ]
 
-  gem.add_runtime_dependency(%q<rubyzip>, [">= 0"])
+  gem.add_runtime_dependency(%q<rubyzip>, ["<1.0.0"])
   gem.add_development_dependency(%q<simplecov>) if RUBY_VERSION >= "1.9"
 end
-