diff --git a/Gemfile.lock b/Gemfile.lock
index 15774fe..86f1754 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,7 +43,7 @@ GEM
     builder (3.2.3)
     byebug (9.0.6)
     coderay (1.1.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.8)
     crass (1.0.3)
     debug_inspector (0.0.3)
     erubis (2.7.0)
@@ -78,7 +78,7 @@ GEM
     pry-rails (0.3.4)
       pry (>= 0.9.10)
     puma (3.6.2)
-    rack (2.0.3)
+    rack (2.2.3)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.3)
@@ -124,7 +124,7 @@ 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)