diff --git a/Gemfile.lock b/Gemfile.lock
index 5e571db..9ea5020 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)
     axiom-types (0.1.1)
       descendants_tracker (~> 0.0.4)
       ice_nine (~> 0.11.0)
@@ -63,7 +63,7 @@ GEM
     multi_json (1.12.1)
     multipart-post (2.0.0)
     nio4r (2.1.0)
-    public_suffix (2.0.5)
+    public_suffix (5.0.0)
     representable (3.0.4)
       declarative (< 0.1.0)
       declarative-option (< 0.2.0)