diff --git a/Gemfile.lock b/Gemfile.lock
index 8baf1d1..20686f6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -86,7 +86,7 @@ GEM
       execjs
     coffee-script-source (1.10.0)
     commonjs (0.2.7)
-    concurrent-ruby (1.0.2)
+    concurrent-ruby (1.1.5)
     connection_pool (2.2.0)
     dynamic_form (1.1.4)
     elastomer-client (0.9.0)
@@ -153,8 +153,7 @@ GEM
       multi_json (~> 1.0)
       websocket-driver (>= 0.2.0)
     power_assert (0.3.0)
-    rack (2.0.0.rc1)
-      json
+    rack (2.0.7)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.0.rc1)
@@ -226,7 +225,7 @@ GEM
     semantic (1.4.1)
     sinatra (1.0)
       rack (>= 1.0)
-    sprockets (3.6.0)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.0.4)