diff --git a/Gemfile.lock b/Gemfile.lock
index 38f6015..eac32f6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    concurrent-ruby (1.1.6)
+    concurrent-ruby (1.3.7)
     diff-lcs (1.3)
     dry-core (0.4.9)
       concurrent-ruby (~> 1.0)