diff --git a/Gemfile.lock b/Gemfile.lock
index 0c7b889..9d9359c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -158,7 +158,7 @@ GEM
       sqlite3 (~> 1.3)
       thin (~> 1.5.0)
     method_source (0.8.2)
-    mime-types (2.5)
+    mime-types (2.6.1)
     mini_portile (0.5.3)
     minitest (4.7.5)
     multi_json (1.11.0)