diff --git a/Gemfile.lock b/Gemfile.lock
index a5f2ff90..8b5c067c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,7 +25,7 @@ GEM
     base64 (0.2.0)
     bigdecimal (3.1.8)
     coderay (1.1.3)
-    concurrent-ruby (1.3.3)
+    concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
     crack (1.0.0)
       bigdecimal