diff --git a/Gemfile b/Gemfile
index fee1d25..a419646 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,7 +23,7 @@ end
 
 group :development do
   gem 'web-console',           '3.5.1'
-  gem 'listen',                '3.1.5'
+  gem 'listen',                '3.5.1'
   gem 'spring',                '2.0.2'
   gem 'spring-watcher-listen', '2.0.1'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 967f73f..46436f9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -259,10 +259,9 @@ GEM
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
     json (2.1.0)
-    listen (3.1.5)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-      ruby_dep (~> 1.2)
+    listen (3.5.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     loofah (2.2.2)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -345,7 +344,6 @@ GEM
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
     ruby-progressbar (1.9.0)
-    ruby_dep (1.5.0)
     sass (3.5.7)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
@@ -412,7 +410,7 @@ DEPENDENCIES
   guard-minitest (= 2.4.6)
   jbuilder (= 2.7.0)
   jquery-rails (= 4.3.1)
-  listen (= 3.1.5)
+  listen (= 3.5.1)
   mini_magick (= 4.7.0)
   minitest (= 5.10.3)
   minitest-reporters (= 1.1.14)