diff --git a/Gemfile.lock b/Gemfile.lock
index 07cbfc5..6eb6f55 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -16,8 +16,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     backports (3.21.0)
     chunky_png (1.3.15)
     coderay (1.1.3)
@@ -108,7 +108,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     ptools (1.3.5)
-    public_suffix (4.0.6)
+    public_suffix (5.0.0)
     rack (2.2.3)
     rack-livereload (0.3.17)
       rack