diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 099626f4..4fcfdf7a 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.8.0"
+  ".": "1.9.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9139bab6..c9405689 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+### 1.9.0 (2025-01-03)
+
+#### Features
+
+* support Rails 8.0 ([#331](https://github.com/googleapis/ruby-spanner-activerecord/issues/331)) 
+
 ### 1.8.0 (2024-12-12)
 
 #### Features
diff --git a/lib/activerecord_spanner_adapter/version.rb b/lib/activerecord_spanner_adapter/version.rb
index 469527cf..6da54fc2 100644
--- a/lib/activerecord_spanner_adapter/version.rb
+++ b/lib/activerecord_spanner_adapter/version.rb
@@ -5,5 +5,5 @@
 # https://opensource.org/licenses/MIT.
 
 module ActiveRecordSpannerAdapter
-  VERSION = "1.8.0".freeze
+  VERSION = "1.9.0".freeze
 end