diff --git a/Gemfile.lock b/Gemfile.lock
index 3d6c70b..aec56cc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -53,7 +53,7 @@ GEM
       xpath (>= 2.0, < 4.0)
     childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.8)
     crass (1.0.3)
     erubi (1.7.1)
     ffi (1.9.23)
@@ -84,7 +84,7 @@ GEM
     pg (1.0.0)
     public_suffix (3.0.2)
     puma (3.11.3)
-    rack (2.0.4)
+    rack (2.2.3)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.1.6)
@@ -135,7 +135,7 @@ 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)