diff --git a/Gemfile.lock b/Gemfile.lock
index 8367f4330..62ddc6743 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,10 +27,14 @@ GEM
     net-scp (1.0.4)
       net-ssh (>= 1.99.1)
     net-ssh (2.1.4)
+    psych (5.1.0)
+      stringio
     rcov (0.9.9)
-    rdoc (3.9.4)
+    rdoc (6.5.0)
+      psych (>= 4.0.0)
     right_http_connection (1.3.0)
     shoulda (2.11.3)
+    stringio (3.0.6)
     thor (0.14.6)
     trollop (1.16.2)
     vagrant (0.8.6)