diff --git a/Gemfile.lock b/Gemfile.lock
index f3650b8..b6b5c2e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -37,8 +37,8 @@ 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 (6.0.4)
     ast (2.4.0)
     babel-source (5.8.35)
@@ -221,7 +221,7 @@ GEM
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    public_suffix (3.0.2)
+    public_suffix (4.0.7)
     puma (4.2.1)
       nio4r (~> 2.0)
     rack (1.6.11)