diff --git a/Gemfile.lock b/Gemfile.lock
index 577a091..010e6a6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -24,7 +24,7 @@ GEM
     benchmark (0.5.0)
     bigdecimal (4.0.1)
     coderay (1.1.3)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     diff-lcs (1.5.1)
     drb (2.2.3)