diff --git a/Gemfile.lock b/Gemfile.lock
index 023bfbe..e112b40 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -86,14 +86,14 @@ GEM
       middleman-core (~> 3.2)
       rouge (~> 1.0)
     minitest (5.5.1)
-    multi_json (1.10.1)
+    multi_json (1.14.1)
     padrino-helpers (0.12.4)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.12.4)
       tilt (~> 1.4.1)
     padrino-support (0.12.4)
       activesupport (>= 3.1)
-    rack (1.6.0)
+    rack (1.6.11)
     rack-livereload (0.3.15)
       rack
     rack-test (0.6.3)
@@ -107,7 +107,7 @@ GEM
     rouge (1.7.2)
     ruby18_source_location (0.2)
     sass (3.4.9)
-    sprockets (2.12.3)
+    sprockets (2.12.5)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)