diff --git a/Gemfile.lock b/Gemfile.lock
index 0f911a1..e087d02 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,7 +33,7 @@ GEM
     ast (2.4.3)
     base64 (0.3.0)
     bigdecimal (4.1.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     crack (1.0.1)
       bigdecimal