diff --git a/Gemfile.lock b/Gemfile.lock
index dadf140..06d8aeb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -44,7 +44,7 @@ GEM
     builder (3.2.3)
     byebug (9.0.6)
     coderay (1.1.1)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.5)
     debug_inspector (0.0.2)
     diff-lcs (1.2.5)
     dotenv (2.2.1)
@@ -92,7 +92,7 @@ GEM
       pry (>= 0.9.10)
     puma (4.3.1)
       nio4r (~> 2.0)
-    rack (2.0.3)
+    rack (2.0.8)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.1.2)
@@ -148,7 +148,7 @@ GEM
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
     slop (3.6.0)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.0)