diff --git a/squib.gemspec b/squib.gemspec
index 505b43e..74d3f73 100644
--- a/squib.gemspec
+++ b/squib.gemspec
@@ -33,6 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'roo', '~> 2.4.0'
   spec.add_runtime_dependency 'rsvg2', '~> 3.0.0'
   spec.add_runtime_dependency 'gobject-introspection', '~> 3.0.0' # for bug 172
+  spec.add_runtime_dependency 'gio2', '~> 3.0.0' # for bug 172
   spec.add_runtime_dependency 'mercenary', '~> 0.3.4'
   spec.add_runtime_dependency 'ruby-progressbar', '~> 1.8'