diff --git a/Gemfile b/Gemfile
index c139d31..14d8e1b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ gem 'hiredis', '~> 0.6.0'
 gem 'haml', '~> 4.0.6'
 gem 'json', '~> 2.1'
 gem 'sidekiq', '~> 5.0.4'
-gem 'mail', '~> 2.6.6'
+gem 'mail', '~> 2.7.0'
 gem 'puma', '~> 3.9.1'
 gem 'newrelic_rpm', '~> 3.18.1'
 gem 'rack_csrf', '~> 2.6.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index d679555..6b1312c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -23,11 +23,9 @@ GEM
     hiredis (0.6.1)
     json (2.1.0)
     jwt (1.5.2)
-    mail (2.6.6)
-      mime-types (>= 1.16, < 4)
-    mime-types (3.1)
-      mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
+    mail (2.7.0)
+      mini_mime (>= 0.1.1)
+    mini_mime (0.1.4)
     multi_json (1.12.1)
     multi_xml (0.5.5)
     multipart-post (2.0.0)
@@ -80,7 +78,7 @@ DEPENDENCIES
   haml (~> 4.0.6)
   hiredis (~> 0.6.0)
   json (~> 2.1)
-  mail (~> 2.6.6)
+  mail (~> 2.7.0)
   newrelic-redis (~> 2.0.0)
   newrelic_rpm (~> 3.18.1)
   puma (~> 3.9.1)