diff --git a/Gemfile.lock b/Gemfile.lock
index a2058de..4d261bc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     bigdecimal (4.0.1)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     descendants_tracker (0.0.4)
       thread_safe (~> 0.3, >= 0.3.1)
     diff-lcs (1.5.0)