diff --git a/Gemfile.lock b/Gemfile.lock
index b96e7322d3..3db681046d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -123,7 +123,7 @@ GEM
     codeclimate-test-reporter (1.0.9)
       simplecov (<= 0.13)
     coderay (1.1.3)
-    concurrent-ruby (1.3.5)
+    concurrent-ruby (1.3.6)
     connection_pool (2.5.5)
     crack (1.0.1)
       bigdecimal