diff --git a/Gemfile.lock b/Gemfile.lock
index 6bb4665..39f4e46 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -60,7 +60,7 @@ GEM
       logger (~> 1.5)
     circleci (2.1.0)
     coderay (1.1.3)
-    concurrent-ruby (1.3.7)
+    concurrent-ruby (1.3.8)
     connection_pool (3.0.2)
     console (1.37.0)
       fiber-annotation