diff --git a/Gemfile.lock b/Gemfile.lock
index c23a158d..cd0e24f6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -96,7 +96,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.5)
     cucumber (2.4.0)
       builder (>= 2.1.2)
       cucumber-core (~> 1.5.0)
@@ -204,7 +204,7 @@ GEM
       pry (~> 0.10)
     public_suffix (2.0.5)
     puma (3.12.0)
-    rack (1.6.5)
+    rack (1.6.11)
     rack-cache (1.7.0)
       rack (>= 0.4)
     rack-no-www (0.0.2)
@@ -270,7 +270,7 @@ GEM
       tilt (>= 1.1, < 3)
     slop (3.6.0)
     spork (0.9.2)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.0)