diff --git a/Gemfile.lock b/Gemfile.lock
index d63a8b0..04920bf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,7 +27,7 @@ GEM
     benchmark (0.5.0)
     bigdecimal (4.1.0)
     bump (0.10.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     diff-lcs (1.6.2)
     drb (2.2.3)