diff --git a/fluent-plugin-enhance-k8s-metadata/Gemfile.lock b/fluent-plugin-enhance-k8s-metadata/Gemfile.lock
index 1624a16..fb2a2d0 100644
--- a/fluent-plugin-enhance-k8s-metadata/Gemfile.lock
+++ b/fluent-plugin-enhance-k8s-metadata/Gemfile.lock
@@ -24,7 +24,7 @@ GEM
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
     bigdecimal (3.1.8)
-    concurrent-ruby (1.2.3)
+    concurrent-ruby (1.3.1)
     connection_pool (2.4.0)
     cool.io (1.7.1)
     crack (1.0.0)