diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 86d0ce7d4..85e5fe6df 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,5 +1,5 @@
 {
-  "gax": "5.0.3",
+  "gax": "5.0.4",
   "tools": "1.0.3",
   "logging-utils": "1.1.1"
 }
diff --git a/gax/CHANGELOG.md b/gax/CHANGELOG.md
index a5044425e..cf853342f 100644
--- a/gax/CHANGELOG.md
+++ b/gax/CHANGELOG.md
@@ -5,6 +5,13 @@
 [1]: https://www.npmjs.com/package/gax-nodejs?activeTab=versions
 
 
+## [5.0.4](https://github.com/googleapis/gax-nodejs/compare/google-gax-v5.0.3...google-gax-v5.0.4) (2025-09-30)
+
+
+### Performance Improvements
+
+* remove abort controller polyfill ([#1802](https://github.com/googleapis/gax-nodejs/issues/1802)) ([b2a8cec](https://github.com/googleapis/gax-nodejs/commit/b2a8cec81919a2c2010f32053598c3c1776ca7dc))
+
 ## [5.0.3](https://github.com/googleapis/gax-nodejs/compare/google-gax-v5.0.2...google-gax-v5.0.3) (2025-08-07)
 
 
diff --git a/gax/package.json b/gax/package.json
index eb2d6d2cb..e11fe7cca 100644
--- a/gax/package.json
+++ b/gax/package.json
@@ -1,6 +1,6 @@
 {
   "name": "google-gax",
-  "version": "5.0.3",
+  "version": "5.0.4",
   "description": "Google API Extensions",
   "main": "build/src/index.js",
   "types": "build/src/index.d.ts",
diff --git a/gax/samples/package.json b/gax/samples/package.json
index 87e6d3afb..e9b63fc17 100644
--- a/gax/samples/package.json
+++ b/gax/samples/package.json
@@ -14,7 +14,7 @@
     "*.js"
   ],
   "dependencies": {
-    "google-gax": "^5.0.3"
+    "google-gax": "^5.0.4"
   },
   "devDependencies": {
     "c8": "^9.0.0",