diff --git a/Gemfile.lock b/Gemfile.lock
index e725649..3bc0549 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
       msgpack (~> 1.2)
     builder (3.2.4)
     byebug (11.1.3)
-    concurrent-ruby (1.2.2)
+    concurrent-ruby (1.3.7)
     crass (1.0.6)
     debug_inspector (1.1.0)
     erubi (1.10.0)