diff --git a/Gemfile.lock b/Gemfile.lock
index 87c7949..453fe31 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -36,8 +36,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       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)
     arel (6.0.3)
     bcrypt (3.1.11)
     builder (3.2.2)
@@ -161,7 +161,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    public_suffix (3.0.2)
+    public_suffix (4.0.7)
     rack (1.6.4)
     rack-test (0.6.3)
       rack (>= 1.0)