diff --git a/Gemfile.lock b/Gemfile.lock
index 73f5160..787c83e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -61,7 +61,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.8)
     crass (1.0.3)
     devise (4.3.0)
       bcrypt (~> 3.0)
@@ -129,7 +129,7 @@ GEM
     pg (0.21.0)
     popper_js (1.12.5)
     puma (3.11.0)
-    rack (2.0.3)
+    rack (2.2.3)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.6)
@@ -182,7 +182,7 @@ 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)