diff --git a/Gemfile.lock b/Gemfile.lock
index 7eb726c..5a2683c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -147,7 +147,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.9.0)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.6)
     connection_pool (2.2.0)
     crass (1.0.3)
     database_cleaner (1.4.0)
@@ -199,7 +199,7 @@ GEM
     jquery-ui-rails (2.0.1)
       jquery-rails
       railties (>= 3.1.0)
-    json (1.8.3)
+    json (2.3.1)
     mail (2.5.4)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
@@ -216,7 +216,7 @@ GEM
       minitest (~> 4.0)
     mocha (1.1.0)
       metaclass (~> 0.0.1)
-    multi_json (1.12.1)
+    multi_json (1.15.0)
     nenv (0.2.0)
     net-scp (2.0.0)
       net-ssh (>= 2.6.5, < 6.0.0)
@@ -249,7 +249,7 @@ GEM
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
     rack (1.4.7)
-    rack-cache (1.2)
+    rack-cache (1.12.0)
       rack (>= 0.4)
     rack-protection (1.5.0)
       rack
@@ -276,8 +276,7 @@ GEM
       thor (>= 0.14.6, < 2.0)
     rainbow (2.0.0)
     rake (10.0.3)
-    rdoc (3.12.2)
-      json (~> 1.4)
+    rdoc (3.9.5)
     recaptcha (4.9.0)
       json
     redis (3.2.1)
@@ -337,7 +336,7 @@ GEM
       net-ssh (>= 2.8.0)
     test-unit (3.1.3)
       power_assert
-    thor (0.19.1)
+    thor (0.20.3)
     thread_safe (0.3.5)
     thread_variables (0.2.0)
     tilt (1.4.1)