diff --git a/Gemfile.lock b/Gemfile.lock
index 747af43..892c96b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -120,7 +120,7 @@ GEM
       bundler (>= 1.2.0)
       thor (~> 1.0)
     cgi (0.5.1)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     connection_pool (2.5.5)
     crack (1.0.0)
       bigdecimal