diff --git a/tutorial-rails/Gemfile.lock b/tutorial-rails/Gemfile.lock
index 5089ff3..fbf3b4a 100644
--- a/tutorial-rails/Gemfile.lock
+++ b/tutorial-rails/Gemfile.lock
@@ -39,6 +39,7 @@ GEM
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
     builder (3.1.4)
+    byebug (11.1.1)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
     coffee-rails (4.0.1)
@@ -70,6 +71,7 @@ GEM
     jquery-rails (3.1.4)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
+    json (1.8.3)
     json (1.8.3-java)
     mail (2.5.4)
       mime-types (~> 1.16)
@@ -96,7 +98,7 @@ GEM
       activesupport (= 4.0.0)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    rake (11.3.0)
+    rake (13.0.1)
     rdoc (4.2.2)
       json (~> 1.4)
     ruby-maven (3.3.12)
@@ -124,6 +126,7 @@ GEM
       therubyrhino_jar (>= 1.7.3)
     therubyrhino_jar (1.7.6)
     thor (0.19.1)
+    thread_safe (0.3.5)
     thread_safe (0.3.5-java)
     tilt (1.4.1)
     treetop (1.4.15)
@@ -143,6 +146,7 @@ GEM
 
 PLATFORMS
   java
+  ruby
 
 DEPENDENCIES
   activerecord-jdbc-adapter