diff --git a/tutorial-rails/Gemfile.lock b/tutorial-rails/Gemfile.lock
index 5089ff3..28252f6 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 (11.1.3)
     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)
@@ -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)
@@ -132,7 +135,7 @@ GEM
     turbolinks (5.0.1)
       turbolinks-source (~> 5)
     turbolinks-source (5.0.0)
-    tzinfo (0.3.51)
+    tzinfo (0.3.61)
     uglifier (3.0.2)
       execjs (>= 0.3.0, < 3)
     virtus (1.0.5)
@@ -143,6 +146,7 @@ GEM
 
 PLATFORMS
   java
+  ruby
 
 DEPENDENCIES
   activerecord-jdbc-adapter