diff --git a/Gemfile.lock b/Gemfile.lock
index 4ed8fd6..38f261b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -171,7 +171,7 @@ GEM
       sqlite3 (~> 1.3)
       thin (~> 1.5.0)
     method_source (0.8.2)
-    mime-types (3.0)
+    mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
     mini_portile2 (2.0.0)