diff --git a/rails/devtips/blog/Gemfile.lock b/rails/devtips/blog/Gemfile.lock
index cd741ac6..36327013 100644
--- a/rails/devtips/blog/Gemfile.lock
+++ b/rails/devtips/blog/Gemfile.lock
@@ -38,8 +38,8 @@ GEM
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     arel (8.0.0)
     bindex (0.5.0)
     builder (3.2.3)
@@ -91,7 +91,7 @@ GEM
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     pg (0.21.0)
-    public_suffix (2.0.5)
+    public_suffix (5.0.0)
     puma (3.12.4)
     rack (2.2.3)
     rack-test (0.6.3)