diff --git a/Gemfile.lock b/Gemfile.lock
index e4d787eb64..f71b71ee4a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -168,7 +168,7 @@ GEM
     climate_control (1.2.0)
     cocoon (1.2.15)
     color_diff (0.1)
-    concurrent-ruby (1.3.3)
+    concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
     cose (1.3.0)
       cbor (~> 0.5.9)