diff --git a/Gemfile b/Gemfile
index 4b66cc4d8..4ff436116 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,7 +20,7 @@ gem 'json',        '1.8.1'
 
 # Authentication
 
-gem 'devise', '3.3.0'
+gem 'devise', '3.4.0'
 gem 'devise_lastseenable', '0.0.4'
 
 # Captcha
diff --git a/Gemfile.lock b/Gemfile.lock
index 597670738..e6c16af82 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -116,10 +116,11 @@ GEM
       rails (>= 3, < 5)
     database_cleaner (1.3.0)
     debugger-linecache (1.2.0)
-    devise (3.3.0)
+    devise (3.4.0)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
       railties (>= 3.2.6, < 5)
+      responders
       thread_safe (~> 0.1)
       warden (~> 1.2.3)
     devise_lastseenable (0.0.4)
@@ -404,6 +405,8 @@ GEM
       redis (~> 3.0, >= 3.0.4)
     remotipart (1.2.1)
     request_store (1.1.0)
+    responders (1.1.1)
+      railties (>= 3.2, < 4.2)
     roxml (3.1.6)
       activesupport (>= 2.3.0)
       nokogiri (>= 1.3.3)
@@ -530,7 +533,7 @@ DEPENDENCIES
   configurate (= 0.2.0)
   cucumber-rails (= 1.4.1)
   database_cleaner (= 1.3.0)
-  devise (= 3.3.0)
+  devise (= 3.4.0)
   devise_lastseenable (= 0.0.4)
   entypo-rails (= 2.2.2)
   factory_girl_rails (= 4.4.1)