diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2eb18801f30f..4c1d59050094 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -805,7 +805,7 @@
   "google-cloud-storage_insights-v1+FILLER": "0.0.0",
   "google-cloud-storage_transfer": "1.5.2",
   "google-cloud-storage_transfer+FILLER": "0.0.0",
-  "google-cloud-storage_transfer-v1": "1.8.1",
+  "google-cloud-storage_transfer-v1": "1.9.0",
   "google-cloud-storage_transfer-v1+FILLER": "0.0.0",
   "google-cloud-support": "1.1.3",
   "google-cloud-support+FILLER": "0.0.0",
diff --git a/google-cloud-storage_transfer-v1/CHANGELOG.md b/google-cloud-storage_transfer-v1/CHANGELOG.md
index e72cbaff9d98..9435b1ef97dd 100644
--- a/google-cloud-storage_transfer-v1/CHANGELOG.md
+++ b/google-cloud-storage_transfer-v1/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+### 1.9.0 (2026-03-19)
+
+#### Features
+
+* Add irb as explicit dependency for Ruby 4.0 compatibility ([#32896](https://github.com/googleapis/google-cloud-ruby/issues/32896)) 
+* Update minimum Ruby to v3.2 and required dependencies for Ruby v4.0 ([#32849](https://github.com/googleapis/google-cloud-ruby/issues/32849)) 
+* Update minimum Ruby to v3.2 and required dependencies for Ruby v4.0 ([#32851](https://github.com/googleapis/google-cloud-ruby/issues/32851)) 
+* Update minimum Ruby to v3.2 and required dependencies for Ruby v4.0 ([#32853](https://github.com/googleapis/google-cloud-ruby/issues/32853)) 
+* Update minimum Ruby to v3.2 and required dependencies for Ruby v4.0 ([#32854](https://github.com/googleapis/google-cloud-ruby/issues/32854)) 
+* Update minimum Ruby to v3.2 and required dependencies for Ruby v4.0 ([#32855](https://github.com/googleapis/google-cloud-ruby/issues/32855)) 
+
 ### 1.8.1 (2025-10-27)
 
 #### Documentation
diff --git a/google-cloud-storage_transfer-v1/lib/google/cloud/storage_transfer/v1/version.rb b/google-cloud-storage_transfer-v1/lib/google/cloud/storage_transfer/v1/version.rb
index e6964fd77731..f5fd21834133 100644
--- a/google-cloud-storage_transfer-v1/lib/google/cloud/storage_transfer/v1/version.rb
+++ b/google-cloud-storage_transfer-v1/lib/google/cloud/storage_transfer/v1/version.rb
@@ -21,7 +21,7 @@ module Google
   module Cloud
     module StorageTransfer
       module V1
-        VERSION = "1.8.1"
+        VERSION = "1.9.0"
       end
     end
   end
diff --git a/google-cloud-storage_transfer-v1/snippets/snippet_metadata_google.storagetransfer.v1.json b/google-cloud-storage_transfer-v1/snippets/snippet_metadata_google.storagetransfer.v1.json
index 704fa3bc613c..973b6d5f215f 100644
--- a/google-cloud-storage_transfer-v1/snippets/snippet_metadata_google.storagetransfer.v1.json
+++ b/google-cloud-storage_transfer-v1/snippets/snippet_metadata_google.storagetransfer.v1.json
@@ -1,7 +1,7 @@
 {
   "client_library": {
     "name": "google-cloud-storage_transfer-v1",
-    "version": "1.8.1",
+    "version": "1.9.0",
     "language": "RUBY",
     "apis": [
       {