diff --git a/Gemfile.lock b/Gemfile.lock
index d7ef60c..fe65495 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -83,7 +83,7 @@ GEM
       i18n (>= 0.4.0)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
-    mime-types (1.21)
+    mime-types (1.22)
     multi_json (1.7.2)
     nested_form (0.3.1)
     nokogiri (1.5.9)