diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 7840fde9..4fcfdf7a 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.8.1"
+  ".": "1.9.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba9f3d97..9ea334fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Release History
 
+### 1.9.0 (2023-12-07)
+
+#### Features
+
+* Include universe_domain in credentials ([#460](https://github.com/googleapis/google-auth-library-ruby/issues/460)) 
+* Use google-cloud-env for more robust Metadata Service access ([#459](https://github.com/googleapis/google-auth-library-ruby/issues/459)) 
+
 ### 1.8.1 (2023-09-19)
 
 #### Documentation
diff --git a/lib/googleauth/version.rb b/lib/googleauth/version.rb
index 88a84e9e..5bdf8baf 100644
--- a/lib/googleauth/version.rb
+++ b/lib/googleauth/version.rb
@@ -16,6 +16,6 @@ module Google
   # Module Auth provides classes that provide Google-specific authorization
   # used to access Google APIs.
   module Auth
-    VERSION = "1.8.1".freeze
+    VERSION = "1.9.0".freeze
   end
 end