diff --git a/2017/jekyll-demo/Gemfile.lock b/2017/jekyll-demo/Gemfile.lock
index 7a6e56ac..daa9b455 100644
--- a/2017/jekyll-demo/Gemfile.lock
+++ b/2017/jekyll-demo/Gemfile.lock
@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
     ffi (1.9.18)
     forwardable-extended (2.6.0)
@@ -33,7 +33,7 @@ GEM
       jekyll (~> 3.3)
     pathutil (0.14.0)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.0)
+    public_suffix (4.0.6)
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)