diff --git a/Gemfile.lock b/Gemfile.lock
index 7b229b6d5..05eca2ab0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -156,7 +156,7 @@ GEM
     climate_control (0.2.0)
     coderay (1.1.3)
     color_diff (0.1)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.9)
     connection_pool (2.2.5)
     cose (1.0.0)
       cbor (~> 0.5.9)