diff --git a/Gemfile.lock b/Gemfile.lock
index b152a04..3e0a199 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -99,7 +99,7 @@ GEM
     mail (2.6.3)
       mime-types (>= 1.16, < 3)
     method_source (0.8.2)
-    mime-types (2.4.3)
+    mime-types (2.5)
     mini_portile (0.6.2)
     minitest (5.6.0)
     multi_json (1.11.0)