diff --git a/Gemfile.lock b/Gemfile.lock
index 9728386..8b45af6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,8 +45,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     ansi (1.5.0)
     backports (3.14.0)
     bitters (1.8.0)
@@ -139,7 +139,7 @@ GEM
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
     parallel (1.17.0)
-    public_suffix (3.0.3)
+    public_suffix (4.0.6)
     rack (2.0.7)
     rack-livereload (0.3.17)
       rack