diff --git a/Gemfile.lock b/Gemfile.lock
index e7f02d0..dc10b0f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
     benchmark (0.5.0)
     bigdecimal (4.0.1)
     coderay (1.1.3)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.8)
     connection_pool (3.0.2)
     crack (0.4.5)
       rexml