diff --git a/Gemfile.lock b/Gemfile.lock
index 5159fec..e359e62 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -168,7 +168,7 @@ GEM
     mail (2.7.0)
       mini_mime (>= 0.1.1)
     method_source (0.9.0)
-    mini_mime (0.1.4)
+    mini_mime (1.0.0)
     mini_portile2 (2.3.0)
     minitest (5.10.3)
     multi_json (1.12.2)