diff --git a/Gemfile.lock b/Gemfile.lock
index 8c96317..08758af 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -42,7 +42,7 @@ GEM
     benchmark (0.4.0)
     bigdecimal (3.1.9)
     builder (3.3.0)
-    concurrent-ruby (1.3.5)
+    concurrent-ruby (1.3.7)
     connection_pool (2.5.0)
     crass (1.0.6)
     date (3.4.1)