diff --git a/Gemfile.lock b/Gemfile.lock
index 89f2525..6cbeefe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.5)
     crass (1.0.4)
     devise (4.4.3)
       bcrypt (~> 3.0)
@@ -172,7 +172,7 @@ GEM
       railties (>= 3.0.0)
     public_suffix (3.0.2)
     puma (3.11.4)
-    rack (2.0.4)
+    rack (2.0.7)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.1.6)
@@ -236,7 +236,7 @@ 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)