diff --git a/Gemfile.lock b/Gemfile.lock
index 46f1162..c9b6474 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,7 +43,7 @@ GEM
     bigdecimal (4.1.2)
     builder (3.3.0)
     coderay (1.1.3)
-    concurrent-ruby (1.3.5)
+    concurrent-ruby (1.3.7)
     connection_pool (2.5.0)
     constant_resolver (0.2.0)
     crass (1.0.6)