diff --git a/Gemfile.lock b/Gemfile.lock
index 2e11993..952267a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,8 +38,8 @@ GEM
       i18n (~> 0.7)
       minitest (~> 5.1)
       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)
     arel (8.0.0)
@@ -109,7 +109,7 @@ GEM
     nio4r (2.3.0)
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
-    public_suffix (3.0.2)
+    public_suffix (4.0.7)
     puma (3.11.3)
     rack (2.0.4)
     rack-test (0.8.3)