diff --git a/Gemfile.lock b/Gemfile.lock
index 34536d18..3d94e6fe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -114,7 +114,7 @@ GEM
     capistrano-rails (1.6.3)
       capistrano (~> 3.1)
       capistrano-bundler (>= 1.1, < 3)
-    concurrent-ruby (1.3.3)
+    concurrent-ruby (1.3.7)
     connection_pool (2.4.1)
     crass (1.0.6)
     date (3.3.4)