diff --git a/Gemfile.lock b/Gemfile.lock
index a9a2dcd..1dc907a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -73,7 +73,7 @@ GEM
     colored2 (3.1.2)
     commander (4.6.0)
       highline (~> 2.0.0)
-    concurrent-ruby (1.1.9)
+    concurrent-ruby (1.3.7)
     declarative (0.0.20)
     digest-crc (0.6.3)
       rake (>= 12.0.0, < 14.0.0)