diff --git a/Gemfile.lock b/Gemfile.lock
index 7741a54..5a885dc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,8 +14,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     coderay (1.1.2)
     concurrent-ruby (1.1.4)
     crack (0.4.3)
@@ -33,7 +33,7 @@ GEM
     minitest (5.11.3)
     multi_xml (0.6.0)
     mustermann (1.0.3)
-    public_suffix (3.0.3)
+    public_suffix (4.0.7)
     rack (2.0.6)
     rack-protection (2.0.5)
       rack