diff --git a/Gemfile.lock b/Gemfile.lock
index a2a8b49..a96ba44 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     autoprefixer-rails (6.3.7)
       execjs
     backports (3.6.8)
@@ -124,6 +125,7 @@ GEM
     padrino-support (0.13.2)
       activesupport (>= 3.1)
     parallel (1.9.0)
+    public_suffix (5.0.0)
     rack (1.6.4)
     rack-livereload (0.3.16)
       rack