diff --git a/Gemfile b/Gemfile
index 6b145aa1..89ed374d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,7 +13,7 @@ group :test do
 end
 
 group :profile do
-  gem 'ruby-prof'
+  gem 'ruby-prof', :platforms => :ruby
 end
 
 platforms :rbx do
diff --git a/axlsx.gemspec b/axlsx.gemspec
index b4cec557..81c30c71 100644
--- a/axlsx.gemspec
+++ b/axlsx.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.test_files  = Dir.glob("{test/**/*}")
 
   s.add_runtime_dependency 'nokogiri', '>= 1.6.6'
-  s.add_runtime_dependency 'rubyzip', '~> 1.1.7'
+  s.add_runtime_dependency 'rubyzip', '~> 1.2'
   s.add_runtime_dependency "htmlentities", "~> 4.3.4"
   s.add_runtime_dependency "mimemagic", "~> 0.3"