diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 08f146f..e037e1b 100644
--- a/docs/Gemfile.lock
+++ b/docs/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 (6.4.1)
       execjs
     backports (3.6.8)
@@ -89,6 +90,7 @@ GEM
     padrino-support (0.13.3.1)
       activesupport (>= 3.1)
     parallel (1.9.0)
+    public_suffix (5.0.0)
     rack (1.6.11)
     rb-fsevent (0.9.7)
     rb-inotify (0.9.7)