diff --git a/examples/simple/Gemfile.lock b/examples/simple/Gemfile.lock
index b652cba..005d0f8 100644
--- a/examples/simple/Gemfile.lock
+++ b/examples/simple/Gemfile.lock
@@ -36,8 +36,8 @@ 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)
     binding_of_caller (0.8.0)
       debug_inspector (>= 0.0.1)
@@ -88,7 +88,7 @@ GEM
     multipart-post (2.0.0)
     nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
-    public_suffix (3.0.3)
+    public_suffix (4.0.7)
     rack (1.6.11)
     rack-test (0.6.3)
       rack (>= 1.0)