diff --git a/Gemfile.lock b/Gemfile.lock
index 30c837be..1cd17453 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.3.7)
     connection_pool (2.3.0)
     crass (1.0.6)
     date (3.3.4)