diff --git a/Gemfile.lock b/Gemfile.lock
index 8b6363b..80da82c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -98,7 +98,7 @@ GEM
       sprockets-helpers (~> 1.1.0)
       sprockets-sass (~> 1.3.0)
     minitest (5.10.3)
-    multi_json (1.12.2)
+    multi_json (1.14.1)
     oj (3.10.6)
     padrino-helpers (0.12.8.1)
       i18n (~> 0.6, >= 0.6.7)
@@ -106,7 +106,7 @@ GEM
       tilt (~> 1.4.1)
     padrino-support (0.12.8.1)
       activesupport (>= 3.1)
-    rack (1.6.8)
+    rack (1.6.13)
     rack-livereload (0.3.15)
       rack
     rack-test (0.6.3)
@@ -120,7 +120,7 @@ GEM
     slim (3.0.0)
       temple (~> 0.7.3)
       tilt (>= 1.3.3, < 2.1)
-    sprockets (2.12.4)
+    sprockets (2.12.5)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)