diff --git a/Gemfile.lock b/Gemfile.lock
index 42cce78..73c58f5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,7 @@ GEM
     bigdecimal (4.1.2)
     coderay (1.1.3)
     colorator (1.1.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     cri (2.15.12)
     csv (3.3.5)
     ddmetrics (1.1.0)