diff --git a/Gemfile.lock b/Gemfile.lock
index df9f563..d690d30 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     bigdecimal (4.0.1)
     coderay (1.1.3)
     colorize (1.1.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     crack (1.0.1)
       bigdecimal
       rexml