diff --git a/Gemfile.lock b/Gemfile.lock
index 0029f50..163e064 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -60,7 +60,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.6)
     devise (4.2.1)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
@@ -120,7 +120,7 @@ GEM
       request_store (~> 1.1)
     pdfkit (0.8.2)
     puma (3.8.2)
-    rack (2.0.2)
+    rack (2.2.2)
     rack-pjax (1.0.0)
       nokogiri (~> 1.5)
       rack (>= 1.1)
@@ -186,7 +186,7 @@ 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 (3.2.0)