diff --git a/Gemfile.lock b/Gemfile.lock
index fc53e94..3987a97 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,7 +46,7 @@ GEM
       activesupport (>= 3.2.0)
       tzinfo
     byebug (10.0.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.5)
     crass (1.0.3)
     diff-lcs (1.3)
     erubi (1.7.1)
@@ -83,7 +83,7 @@ GEM
       mini_portile2 (~> 2.3.0)
     pg (1.0.0)
     puma (3.11.3)
-    rack (2.0.4)
+    rack (2.0.7)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.1.6)
@@ -142,7 +142,7 @@ 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)