diff --git a/Gemfile.lock b/Gemfile.lock
index 5e4903b..7618dad 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,11 +2,13 @@ PATH
   remote: .
   specs:
     svi (0.1.0)
+      yawpa (~> 1.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
     rake (10.4.2)
+    yawpa (1.3.0)
 
 PLATFORMS
   ruby
diff --git a/svi.gemspec b/svi.gemspec
index 45125b7..303d3db 100644
--- a/svi.gemspec
+++ b/svi.gemspec
@@ -28,6 +28,7 @@ Gem::Specification.new do |spec|
   spec.extensions    = %w[ext/svi/extconf.rb]
   spec.require_paths = ["lib"]
 
+  spec.add_dependency "yawpa", "~> 1.0"
   spec.add_development_dependency "bundler", "~> 1.10"
   spec.add_development_dependency "rake", "~> 10.0"
 end