diff --git a/Gemfile.lock b/Gemfile.lock
index 3613ccb..b664c1a 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 (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     builder (3.2.3)
     concurrent-ruby (1.0.5)
     coveralls (0.8.19)
@@ -66,7 +66,7 @@ GEM
       rack (>= 1.2, < 3)
     power_assert (0.2.6)
     psych (2.2.4)
-    public_suffix (2.0.5)
+    public_suffix (4.0.6)
     rack (2.0.1)
     rake (12.0.0)
     rdoc (3.12.2)