diff --git a/Gemfile.lock b/Gemfile.lock
index d8fde50..966c655 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,8 +7,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       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)
     backports (3.6.6)
     bcrypt (3.1.11)
     bcrypt-ruby (3.1.5)
@@ -76,7 +76,7 @@ GEM
     multi_json (1.12.1)
     open4 (1.3.4)
     pg (0.20.0)
-    public_suffix (2.0.5)
+    public_suffix (4.0.6)
     rack (1.6.5)
     rack-protection (1.5.3)
       rack