diff --git a/HISTORY.md b/HISTORY.md
index f518a23e7..c39d40fee 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -9,9 +9,12 @@ All notable changes to this project will be documented in this file.
 * Build
   * Use _TypeScript_ `v5.9.3` now, was `v5.9.2` (via [#1308])
   * Use _webpack_ `v5.102.0` now, was `v5.101.3` (via [#1309])
+* Dependencies
+  * Support optional peer dependency `xmlbuilder2@^3.0.2||^4.0.0`, was `xmlbuilder2@^3.0.2` (via [#1321]) 
 
 [#1308]: https://github.com/CycloneDX/cyclonedx-javascript-library/pull/1308
 [#1309]: https://github.com/CycloneDX/cyclonedx-javascript-library/pull/1309
+[#1321]: https://github.com/CycloneDX/cyclonedx-javascript-library/pull/1321
 
 ## 9.0.0 -- 2025-09-15
 
diff --git a/examples/node/javascript/package.json b/examples/node/javascript/package.json
index eb6467451..36869a5e5 100644
--- a/examples/node/javascript/package.json
+++ b/examples/node/javascript/package.json
@@ -2,9 +2,12 @@
   "private": true,
   "name": "@cyclonedx/cyclonedx-library-examples-node-javascript",
   "license": "Apache-2.0",
+  "engines": {
+    "node": ">=20.18.0"
+  },
   "dependencies": {
     "@cyclonedx/cyclonedx-library": "file:../../..",
-    "xmlbuilder2": "^3.0.2"
+    "xmlbuilder2": "^3.0.2||^4.0.0"
   },
   "optionalDependencies": {
     "ajv": "^8.12.0",
diff --git a/examples/node/typescript/example.cjs/package.json b/examples/node/typescript/example.cjs/package.json
index d1c7fbf77..d9c1885b5 100644
--- a/examples/node/typescript/example.cjs/package.json
+++ b/examples/node/typescript/example.cjs/package.json
@@ -3,9 +3,12 @@
   "name": "@cyclonedx/cyclonedx-library-examples-node-typescript-example-cjs",
   "license": "Apache-2.0",
   "type": "commonjs",
+  "engines": {
+    "node": ">=20.18.0"
+  },
   "dependencies": {
     "@cyclonedx/cyclonedx-library": "file:../../../..",
-    "xmlbuilder2": "^3.0.2"
+    "xmlbuilder2": "^3.0.2||^4.0.0"
   },
   "optionalDependencies": {
     "ajv": "^8.12.0",
diff --git a/examples/node/typescript/example.mjs/package.json b/examples/node/typescript/example.mjs/package.json
index 6d4d34fe0..742e6753d 100644
--- a/examples/node/typescript/example.mjs/package.json
+++ b/examples/node/typescript/example.mjs/package.json
@@ -4,11 +4,11 @@
   "license": "Apache-2.0",
   "type": "module",
   "engines": {
-    "node": ">=16"
+    "node": ">=20.18.0"
   },
   "dependencies": {
     "@cyclonedx/cyclonedx-library": "file:../../../..",
-    "xmlbuilder2": "^3.0.2"
+    "xmlbuilder2": "^3.0.2||^4.0.0"
   },
   "optionalDependencies": {
     "ajv": "^8.12.0",
diff --git a/package.json b/package.json
index 751c30126..771c63200 100644
--- a/package.json
+++ b/package.json
@@ -88,7 +88,7 @@
     "ajv-formats": "^3.0.1",
     "ajv-formats-draft2019": "^1.6.1",
     "libxmljs2": "^0.35||^0.37",
-    "xmlbuilder2": "^3.0.2"
+    "xmlbuilder2": "^3.0.2||^4.0.0"
   },
   "peerDependenciesMeta": {
     "ajv": {
@@ -112,7 +112,7 @@
     "ajv-formats": "^3.0.1",
     "ajv-formats-draft2019": "^1.6.1",
     "libxmljs2": "^0.35||^0.37",
-    "xmlbuilder2": "^3.0.2",
+    "xmlbuilder2": "^3.0.2||^4.0.0",
     "@types/mocha": "^10",
     "@types/node": "ts5.7",
     "@types/spdx-expression-parse": "^3",