diff --git a/Gemfile.lock b/Gemfile.lock
index 83340ce..ee0a433 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,7 @@ GEM
       tzinfo (~> 2.0)
     ast (2.4.2)
     coderay (1.1.3)
-    concurrent-ruby (1.2.2)
+    concurrent-ruby (1.3.7)
     csv (3.2.6)
     diff-lcs (1.4.4)
     ffi (1.15.5)