diff --git a/Gemfile b/Gemfile
index f055139..d44f0d0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'pg'
 gem 'sass-rails', '~> 4.0.0'
 
 # Use Uglifier as compressor for JavaScript assets
-gem 'uglifier', '>= 1.3.0'
+gem 'uglifier', '>= 2.3.0'
 
 # Use CoffeeScript for .js.coffee assets and views
 gem 'coffee-rails', '~> 4.0.0'
@@ -29,7 +29,7 @@ gem 'jbuilder', '~> 1.2'
 
 group :doc do
   # bundle exec rake doc:rails generates the API under doc/api.
-  gem 'sdoc', require: false
+  gem 'sdoc', '>= 0.4.0', require: false
 end
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 8ace359..e012c15 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,7 +45,7 @@ GEM
     coffee-script-source (1.6.3)
     debug_inspector (0.0.2)
     erubis (2.7.0)
-    execjs (2.0.2)
+    execjs (2.7.0)
     hike (1.2.3)
     i18n (0.6.5)
     jbuilder (1.5.2)
@@ -54,7 +54,6 @@ GEM
     jquery-rails (3.0.4)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.1)
     mail (2.5.4)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
@@ -80,16 +79,14 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (10.1.0)
-    rdoc (3.12.2)
-      json (~> 1.4)
+    rdoc (6.2.1)
     sass (3.2.12)
     sass-rails (4.0.1)
       railties (>= 4.0.0, < 5.0)
       sass (>= 3.1.10)
       sprockets-rails (~> 2.0.0)
-    sdoc (0.3.20)
-      json (>= 1.1.3)
-      rdoc (~> 3.10)
+    sdoc (1.1.0)
+      rdoc (>= 5.0)
     sprockets (2.10.0)
       hike (~> 1.2)
       multi_json (~> 1.0)
@@ -109,9 +106,8 @@ GEM
     turbolinks (1.3.0)
       coffee-rails
     tzinfo (0.3.38)
-    uglifier (2.3.0)
-      execjs (>= 0.3.0)
-      json (>= 1.8.0)
+    uglifier (4.2.0)
+      execjs (>= 0.3.0, < 3)
 
 PLATFORMS
   ruby
@@ -126,6 +122,9 @@ DEPENDENCIES
   pg
   rails (= 4.0.0)
   sass-rails (~> 4.0.0)
-  sdoc
+  sdoc (>= 0.4.0)
   turbolinks
-  uglifier (>= 1.3.0)
+  uglifier (>= 2.3.0)
+
+BUNDLED WITH
+   1.17.3