diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 38cb4034b531..67643ff19be0 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1059,7 +1059,7 @@
   "google-shopping-merchant-notifications-v1+FILLER": "0.0.0",
   "google-shopping-merchant-notifications-v1beta": "0.7.0",
   "google-shopping-merchant-notifications-v1beta+FILLER": "0.0.0",
-  "google-shopping-merchant-order_tracking": "0.3.0",
+  "google-shopping-merchant-order_tracking": "0.4.0",
   "google-shopping-merchant-order_tracking+FILLER": "0.0.0",
   "google-shopping-merchant-order_tracking-v1": "0.4.0",
   "google-shopping-merchant-order_tracking-v1+FILLER": "0.0.0",
diff --git a/google-shopping-merchant-order_tracking/CHANGELOG.md b/google-shopping-merchant-order_tracking/CHANGELOG.md
index 5abd32eb3c3f..c4b3664446e9 100644
--- a/google-shopping-merchant-order_tracking/CHANGELOG.md
+++ b/google-shopping-merchant-order_tracking/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+### 0.4.0 (2026-08-04)
+
+#### Features
+
+* Upgrade protobuf to v33.2 ([#35100](https://github.com/googleapis/google-cloud-ruby/issues/35100)) 
+
 ### 0.3.0 (2026-06-11)
 
 #### Features
diff --git a/google-shopping-merchant-order_tracking/lib/google/shopping/merchant/order_tracking/version.rb b/google-shopping-merchant-order_tracking/lib/google/shopping/merchant/order_tracking/version.rb
index 7898d2f71d9a..62f9a520db05 100644
--- a/google-shopping-merchant-order_tracking/lib/google/shopping/merchant/order_tracking/version.rb
+++ b/google-shopping-merchant-order_tracking/lib/google/shopping/merchant/order_tracking/version.rb
@@ -21,7 +21,7 @@ module Google
   module Shopping
     module Merchant
       module OrderTracking
-        VERSION = "0.3.0"
+        VERSION = "0.4.0"
       end
     end
   end