diff --git a/doc/Gemfile.lock b/doc/Gemfile.lock
index adacad9..5b67d9c 100644
--- a/doc/Gemfile.lock
+++ b/doc/Gemfile.lock
@@ -6,8 +6,8 @@ GEM
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.0)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     autoprefixer-rails (6.6.1)
       execjs
     backports (3.6.8)
@@ -87,7 +87,7 @@ GEM
     padrino-support (0.13.3.3)
       activesupport (>= 3.1)
     parallel (1.10.0)
-    public_suffix (2.0.5)
+    public_suffix (5.0.0)
     rack (2.0.1)
     rb-fsevent (0.9.8)
     rb-inotify (0.9.8)