diff --git a/Gemfile.lock b/Gemfile.lock
index 9797119..7c2eaf4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,8 +15,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     concurrent-ruby (1.0.5)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
@@ -37,7 +37,7 @@ GEM
       faraday_middleware (~> 0.9)
     minitest (5.11.3)
     multipart-post (2.0.0)
-    public_suffix (3.0.3)
+    public_suffix (4.0.6)
     rake (10.5.0)
     safe_yaml (1.0.4)
     simplecov (0.16.1)