diff --git a/Gemfile b/Gemfile
index 413ee03..f8795b4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -40,7 +40,7 @@ gem 'spring',        group: :development
 
 gem 'twitter-bootstrap-rails'
 
-gem 'devise'
+gem 'devise', '>= 4.6.0'
 
 gem 'rails_12factor', group: :production
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 99b74f0..c6d7411 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,8 +33,8 @@ GEM
     aws-sdk-v1 (1.66.0)
       json (~> 1.4)
       nokogiri (>= 1.4.4)
-    bcrypt (3.1.10)
-    builder (3.2.2)
+    bcrypt (3.1.12)
+    builder (3.2.3)
     climate_control (0.0.3)
       activesupport (>= 3.0)
     cocaine (0.5.7)
@@ -46,12 +46,12 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.9.1.1)
-    devise (3.5.2)
+    concurrent-ruby (1.1.5)
+    devise (4.6.1)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
-      railties (>= 3.2.6, < 5)
+      railties (>= 4.1.0, < 6.0)
       responders
-      thread_safe (~> 0.1)
       warden (~> 1.2.3)
     erubis (2.7.0)
     execjs (2.6.0)
@@ -61,7 +61,8 @@ GEM
     haml (4.0.7)
       tilt
     hike (1.2.3)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jbuilder (2.3.2)
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)
@@ -70,7 +71,7 @@ GEM
       thor (>= 0.14, < 2.0)
     jquery-ui-rails (5.0.5)
       railties (>= 3.2.16)
-    json (1.8.3)
+    json (1.8.6)
     kaminari (0.16.3)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
@@ -80,7 +81,7 @@ GEM
     mime-types (2.6.2)
     mimemagic (0.3.0)
     mini_portile (0.6.2)
-    minitest (5.8.1)
+    minitest (5.11.3)
     multi_json (1.11.2)
     nested_form (0.3.2)
     nokogiri (1.6.6.2)
@@ -133,7 +134,7 @@ GEM
       activesupport (= 4.1.8)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    rake (10.4.2)
+    rake (12.3.2)
     rdoc (4.2.0)
     ref (2.0.0)
     remotipart (1.2.1)
@@ -162,8 +163,8 @@ GEM
     therubyracer (0.12.2)
       libv8 (~> 3.16.14.0)
       ref
-    thor (0.19.1)
-    thread_safe (0.3.5)
+    thor (0.20.3)
+    thread_safe (0.3.6)
     tilt (1.4.1)
     turbolinks (2.5.3)
       coffee-rails
@@ -172,12 +173,12 @@ GEM
       execjs (~> 2.2)
       rails (~> 4.1)
       railties (~> 4.1)
-    tzinfo (1.2.2)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uglifier (2.7.2)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
-    warden (1.2.3)
+    warden (1.2.7)
       rack (>= 1.0)
 
 PLATFORMS
@@ -186,7 +187,7 @@ PLATFORMS
 DEPENDENCIES
   aws-sdk (< 2.0)
   coffee-rails (~> 4.0.0)
-  devise
+  devise (>= 4.6.0)
   geocoder
   jbuilder (~> 2.0)
   jquery-rails
@@ -205,4 +206,4 @@ DEPENDENCIES
   uglifier (>= 1.3.0)
 
 BUNDLED WITH
-   1.10.6
+   1.17.3