diff --git a/Gemfile.lock b/Gemfile.lock
index 767fb6f..8834f40 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -76,7 +76,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.5)
     crass (1.0.3)
     erubi (1.7.0)
     execjs (2.7.0)
@@ -111,7 +111,7 @@ GEM
       mini_portile2 (~> 2.3.0)
     public_suffix (3.0.1)
     puma (3.11.0)
-    rack (2.0.3)
+    rack (2.0.8)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
     rails (5.1.4)
@@ -162,7 +162,7 @@ GEM
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
       spring (>= 1.2, < 3.0)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)