diff --git a/Gemfile.lock b/Gemfile.lock
index 8166041..d23deb5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
       msgpack (~> 1.2)
     builder (3.3.0)
     coderay (1.1.3)
-    concurrent-ruby (1.3.3)
+    concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
     crass (1.0.6)
     date (3.3.4)