diff --git a/Gemfile.lock b/Gemfile.lock
index 433d549..45e0612 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -149,13 +149,16 @@ GEM
       coderay (~> 1.0)
       method_source (~> 0.8)
       slop (~> 3.4)
+    psych (5.1.2)
+      stringio
     pusher-client (0.6.0)
       json
       websocket (~> 1.0)
     racc (1.6.2)
     rack (3.0.7)
     rake (13.0.1)
-    rdoc (6.3.2)
+    rdoc (6.6.3.1)
+      psych (>= 4.0.0)
     rest-client (1.6.8)
       mime-types (~> 1.16)
       rdoc (>= 2.4.2)
@@ -190,6 +193,7 @@ GEM
     stove (3.2.1)
       chef-api (~> 0.5)
       logify (~> 0.2)
+    stringio (3.1.0)
     systemu (2.5.2)
     test-kitchen (1.2.1)
       mixlib-shellout (~> 1.2)