diff --git a/Gemfile.lock b/Gemfile.lock
index 55e02a7..a97cbba 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,8 +6,8 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.9.0)
+      public_suffix (>= 2.0.2, < 8.0)
     ast (2.4.0)
     awesome_print (1.8.0)
     coderay (1.1.2)
@@ -24,7 +24,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     psych (3.1.0)
-    public_suffix (4.0.6)
+    public_suffix (5.1.1)
     rainbow (3.0.0)
     rake (13.0.1)
     rspec (3.8.0)