diff --git a/Gemfile.lock b/Gemfile.lock
index a0b9a61..aa99f97 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -80,7 +80,7 @@ GEM
       rubocop-rspec (~> 2.28.0)
     bigdecimal (4.1.2)
     builder (3.3.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     crack (1.0.0)
       bigdecimal