diff --git a/Gemfile.lock b/Gemfile.lock
index 6aad334..c9668a1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -61,7 +61,7 @@ GEM
     builder (3.2.3)
     byebug (9.0.6)
     chartkick (2.0.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.7)
     connection_pool (2.2.1)
     dotenv (2.2.1)
     dotenv-rails (2.2.1)
@@ -108,7 +108,7 @@ GEM
     nio4r (2.0.0)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
-    rack (2.0.2)
+    rack (2.2.3)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)
@@ -164,7 +164,7 @@ GEM
       actionpack (>= 3.1)
       railties (>= 3.1)
       slim (~> 3.0)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.0)