diff --git a/Gemfile.lock b/Gemfile.lock
index 4f56195..3636cee 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 (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     airbrussh (1.3.0)
       sshkit (>= 1.6.1, != 1.7.0)
     attr_extras (4.4.0)
@@ -148,7 +148,7 @@ GEM
       nokogiri
     pony (1.11)
       mail (>= 2.0)
-    public_suffix (3.0.0)
+    public_suffix (5.0.0)
     rack (2.0.3)
     rack-cache (1.7.1)
       rack (>= 0.4)