diff --git a/examples/rails_app/Gemfile.lock b/examples/rails_app/Gemfile.lock
index f939b1e..8a6e36b 100644
--- a/examples/rails_app/Gemfile.lock
+++ b/examples/rails_app/Gemfile.lock
@@ -42,8 +42,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     archive-zip (0.12.0)
       io-like (~> 0.3.0)
     arel (9.0.0)
@@ -106,7 +106,7 @@ GEM
     nio4r (2.3.1)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
-    public_suffix (3.0.3)
+    public_suffix (4.0.6)
     puma (4.3.11)
       nio4r (~> 2.0)
     rack (2.2.3)