diff --git a/Gemfile.lock b/Gemfile.lock
index 24fbf612c..dbadc813f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -32,7 +32,7 @@ GEM
     benchmark (0.4.0)
     benchmark-ips (2.14.0)
     bigdecimal (3.1.9)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.5)
     connection_pool (2.5.0)
     csv (3.3.2)
     dbm (1.1.0)