diff --git a/fluent-plugin-protobuf/Gemfile.lock b/fluent-plugin-protobuf/Gemfile.lock
index b764e23..c3955a3 100644
--- a/fluent-plugin-protobuf/Gemfile.lock
+++ b/fluent-plugin-protobuf/Gemfile.lock
@@ -23,7 +23,7 @@ GEM
       tzinfo-data (~> 1.0)
       webrick (~> 1.4)
       yajl-ruby (~> 1.0)
-    google-protobuf (3.23.4)
+    google-protobuf (3.24.0)
     http_parser.rb (0.8.0)
     msgpack (1.6.0)
     power_assert (2.0.3)