diff --git a/Gemfile.lock b/Gemfile.lock
index a972054ced6..b8d998f2bb9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -78,14 +78,14 @@ GEM
       middleman-core (~> 3.2)
       rouge (~> 1.0)
     minitest (4.7.5)
-    multi_json (1.9.2)
+    multi_json (1.15.0)
     padrino-helpers (0.12.1)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.12.1)
       tilt (~> 1.4.1)
     padrino-support (0.12.1)
       activesupport (>= 3.1)
-    rack (1.5.2)
+    rack (1.6.13)
     rack-livereload (0.3.15)
       rack
     rack-test (0.6.2)
@@ -101,7 +101,7 @@ GEM
     rouge (1.3.3)
     ruby18_source_location (0.2)
     sass (3.2.19)
-    sprockets (2.12.1)
+    sprockets (2.12.5)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)