diff --git a/Gemfile.lock b/Gemfile.lock
index 9805d7f..6efadea 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -165,12 +165,9 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.12)
-    mail (2.6.6)
-      mime-types (>= 1.16, < 4)
+    mail (2.7.0)
+      mini_mime (>= 0.1.1)
     method_source (0.9.0)
-    mime-types (3.1)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
     mini_mime (0.1.4)
     mini_portile2 (2.3.0)
     minitest (5.10.3)
@@ -188,7 +185,7 @@ GEM
       capybara (~> 2.1)
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)
-    powder (0.3.2)
+    powder (0.3.3)
       thor (>= 0.11.5)
     power_assert (1.1.1)
     pry (0.11.2)
@@ -360,4 +357,4 @@ RUBY VERSION
    ruby 2.4.2p198
 
 BUNDLED WITH
-   1.16.0.pre.3
+   1.16.0