diff --git a/Gemfile.lock b/Gemfile.lock
index 43fa837..71d94e1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.6)
     crass (1.0.3)
     erubis (2.7.0)
     execjs (2.7.0)
@@ -85,7 +85,7 @@ GEM
     nokogiri (1.8.2-x86-mingw32)
       mini_portile2 (~> 2.3.0)
     puma (3.11.3)
-    rack (2.0.4)
+    rack (2.2.3)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.7)
@@ -126,7 +126,7 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)