diff --git a/Gemfile.lock b/Gemfile.lock
index ef5d88d..5cc3624 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
     hoe (3.13.0)
       rake (>= 0.8, < 11.0)
     i18n (0.6.11)
-    json (1.8.1)
+    json (1.8.6)
     metaclass (0.0.4)
     minimization (0.2.1)
       rb-gsl (~> 1.2)
@@ -36,8 +36,7 @@ GEM
     rake (10.3.2)
     rb-gsl (1.16.0.2)
       narray (>= 0.5.9)
-    rdoc (4.1.2)
-      json (~> 1.4)
+    rdoc (6.3.1)
     reportbuilder (1.4.2)
       clbustos-rtf (~> 0.4.0)
       prawn (~> 0.8.4)