diff --git a/Gemfile.lock b/Gemfile.lock
index 2c2a62f1..5f54e606 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -145,7 +145,7 @@ GEM
       faraday-multipart (~> 1.0, >= 1.0.4)
     cocoon (1.2.15)
     colorize (1.1.0)
-    concurrent-ruby (1.2.3)
+    concurrent-ruby (1.3.1)
     countable-rails (0.0.1)
       railties (>= 3.1)
     crack (1.0.0)