diff --git a/Gemfile.lock b/Gemfile.lock
index d792f8c..26f4f3b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,8 +6,8 @@ GEM
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     backports (3.8.0)
     chunky_png (1.3.5)
     coffee-script (2.4.1)
@@ -110,7 +110,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.11.2)
     ptools (1.3.3)
-    public_suffix (2.0.5)
+    public_suffix (5.0.0)
     rack (2.0.3)
     rack-livereload (0.3.16)
       rack