diff --git a/Gemfile.lock b/Gemfile.lock
index 710310b..f26c58c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,8 +6,8 @@ GEM
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     backports (3.11.1)
     chunky_png (1.3.10)
     coffee-script (2.4.1)
@@ -103,7 +103,7 @@ GEM
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
     parallel (1.12.1)
-    public_suffix (3.0.2)
+    public_suffix (5.0.0)
     rack (2.0.4)
     rack-livereload (0.3.16)
       rack