diff --git a/Gemfile.lock b/Gemfile.lock
index 3dffd14..7462067 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,8 +6,8 @@ GEM
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     albino (1.3.3)
       posix-spawn (>= 0.3.6)
     autoprefixer-rails (6.7.7.2)
@@ -100,7 +100,7 @@ GEM
     parallel (1.11.1)
     posix-spawn (0.3.13)
     ptools (1.3.3)
-    public_suffix (2.0.5)
+    public_suffix (4.0.6)
     pygmentize (0.0.3)
     rack (2.0.1)
     rack-livereload (0.3.16)