diff --git a/Gemfile b/Gemfile
index 7d7f72b..593a158 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,5 @@
 source 'https://rubygems.org/'
 
 # Specify your gem's dependencies in paperclip-av-transcoder.gemspec
+gem "av", git: 'git://github.com/JialiTian/av.git'
 gemspec
diff --git a/paperclip-av-transcoder.gemspec b/paperclip-av-transcoder.gemspec
index c62aa5c..4b5437a 100644
--- a/paperclip-av-transcoder.gemspec
+++ b/paperclip-av-transcoder.gemspec
@@ -26,5 +26,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "coveralls"
 
   spec.add_dependency "paperclip", ">=2.5.2"
-  spec.add_dependency "av", "~> 0.9.0"
+  spec.add_dependency "av"
 end