diff --git a/Gemfile.lock b/Gemfile.lock
index 038566a5d..38174e0f7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -155,7 +155,7 @@ GEM
       climate_control (>= 0.0.3, < 1.0)
     coderay (1.1.3)
     color_diff (0.1)
-    concurrent-ruby (1.1.7)
+    concurrent-ruby (1.1.8)
     connection_pool (2.2.3)
     cose (1.0.0)
       cbor (~> 0.5.9)