diff --git a/Gemfile.lock b/Gemfile.lock
index 3f80c10d05..058c43f1b7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -121,7 +121,7 @@ GEM
     codeclimate-test-reporter (1.0.9)
       simplecov (<= 0.13)
     coderay (1.1.3)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.5)
     connection_pool (2.4.1)
     crack (1.0.0)
       bigdecimal