diff --git a/Gemfile.lock b/Gemfile.lock
index dad86340..70b4706a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
     base64 (0.2.0)
     benchmark (0.4.0)
     bigdecimal (3.1.9)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.5)
     connection_pool (2.5.0)
     diff-lcs (1.5.1)
     docile (1.4.1)