diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0763802..87cb518 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 ## ChangeLog
 
+### Release 1.3.2 - 2019/08/16
+
+- Input plugin
+  - Make `topic` parameter optional
+
 ### Release 1.3.1 - 2018/06/08
 
 - Input plugin
diff --git a/fluent-plugin-gcloud-pubsub-custom.gemspec b/fluent-plugin-gcloud-pubsub-custom.gemspec
index d6d70eb..37b5045 100644
--- a/fluent-plugin-gcloud-pubsub-custom.gemspec
+++ b/fluent-plugin-gcloud-pubsub-custom.gemspec
@@ -7,7 +7,7 @@ Gem::Specification.new do |gem|
   gem.license     = "MIT"
   gem.homepage    = "https://github.com/mia-0032/fluent-plugin-gcloud-pubsub-custom"
   gem.summary     = gem.description
-  gem.version     = "1.3.1"
+  gem.version     = "1.3.2"
   gem.authors     = ["Yoshihiro MIYAI"]
   gem.email       = "msparrow17@gmail.com"
   gem.has_rdoc    = false