diff --git a/Gemfile.lock b/Gemfile.lock
index 14ee55f..29ce0d5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -82,7 +82,7 @@ GEM
     mail (2.6.1)
       mime-types (>= 1.16, < 3)
     method_source (0.8.2)
-    mime-types (2.4.2)
+    mime-types (2.4.3)
     mini_portile (0.6.0)
     minitest (5.4.2)
     multi_json (1.10.1)