diff --git a/Gemfile.lock b/Gemfile.lock
index 6d0aee0..0ecf3df 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -90,7 +90,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.10.0)
-    concurrent-ruby (1.0.2)
+    concurrent-ruby (1.1.6)
     connection_pool (2.2.0)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
@@ -172,7 +172,7 @@ GEM
     pry-rails (0.3.4)
       pry (>= 0.9.10)
     puma (3.6.0)
-    rack (2.0.1)
+    rack (2.2.2)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)
@@ -251,7 +251,7 @@ GEM
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
       spring (>= 1.2, < 3.0)
-    sprockets (3.7.0)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.0)