diff --git a/hartl-rails/sample-app/Gemfile.lock b/hartl-rails/sample-app/Gemfile.lock
index f16e9cbe..5cf6b083 100644
--- a/hartl-rails/sample-app/Gemfile.lock
+++ b/hartl-rails/sample-app/Gemfile.lock
@@ -97,7 +97,7 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mini_portile2 (2.1.0)
+    mini_portile2 (2.8.0)
     minitest (5.10.1)
     minitest-reporters (1.1.9)
       ansi
@@ -107,8 +107,9 @@ GEM
     multi_json (1.12.1)
     nenv (0.3.0)
     nio4r (1.2.1)
-    nokogiri (1.7.0.1)
-      mini_portile2 (~> 2.1.0)
+    nokogiri (1.13.9)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -118,6 +119,7 @@ GEM
       method_source (~> 0.8.1)
       slop (~> 3.4)
     puma (3.4.0)
+    racc (1.6.0)
     rack (2.0.1)
     rack-test (0.6.3)
       rack (>= 1.0)