diff --git a/.github/workflows/prerelease.yaml b/.github/workflows/prerelease.yaml
index cbcdbc479..f174501c8 100644
--- a/.github/workflows/prerelease.yaml
+++ b/.github/workflows/prerelease.yaml
@@ -53,7 +53,7 @@ jobs:
         uses: ilammy/msvc-dev-cmd@v1
         if: contains(matrix.os, 'windows')
       - name: install dependencies
-        run: npm install --ws=@jazzer.js/fuzzer
+        run: npm ci --ws=@jazzer.js/fuzzer
       - name: build and upload prebuilds
         run: >
           npm run prebuild --workspace=@jazzer.js/fuzzer -- ${{ matrix.opts }}
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index ffeacdfe3..b67414b26 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -18,7 +18,7 @@ jobs:
           cache: "npm"
           registry-url: https://registry.npmjs.org
       - name: install & build
-        run: npm install && npm run build
+        run: npm ci && npm run build
       - name: publish to npm
         run: npm publish --workspaces --access public
         env:
diff --git a/.github/workflows/run-all-tests.yaml b/.github/workflows/run-all-tests.yaml
index 35e2cec38..e49d4cc96 100644
--- a/.github/workflows/run-all-tests.yaml
+++ b/.github/workflows/run-all-tests.yaml
@@ -17,7 +17,7 @@ jobs:
           node-version: 16
           cache: "npm"
       - name: install dependencies
-        run: npm install
+        run: npm ci
       - name: install dependencies with apt
         run: |
           wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
@@ -39,26 +39,65 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, windows-2019, macos-11]
+        os: [windows-2019, macos-11, ubuntu-20.04]
+        node: [16]
+        include:
+          # Test all LTS versions on Linux
+          - os: ubuntu-20.04
+            node: 18
+          - os: ubuntu-20.04
+            node: 20
     steps:
       - name: checkout
         uses: actions/checkout@v3
       - name: node
         uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version: ${{ matrix.node }}
           cache: "npm"
       - name: MSVC (windows)
         uses: ilammy/msvc-dev-cmd@v1
         if: contains(matrix.os, 'windows')
       - name: install dependencies
-        run: npm install
+        run: npm ci
       - name: build project
         run: npm run build
       - name: build fuzzer
         run: npm run build --workspace=@jazzer.js/fuzzer
       - name: run all tests
         run: npm run test
+  examples:
+    name: examples
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-2019, macos-11, ubuntu-20.04]
+        node: [16]
+        include:
+          # Test all LTS versions on Linux
+          - os: ubuntu-20.04
+            node: 18
+          - os: ubuntu-20.04
+            node: 20
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3
+      - name: node
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node }}
+          cache: "npm"
+      - name: MSVC (windows)
+        uses: ilammy/msvc-dev-cmd@v1
+        if: contains(matrix.os, 'windows')
+      - name: install dependencies
+        run: npm ci
+      - name: build project
+        run: npm run build
+      - name: build fuzzer
+        run: npm run build --workspace=@jazzer.js/fuzzer
+      - name: run all examples
+        run: npm run example
   fuzz_tests:
     name: fuzz tests
     runs-on: ubuntu-20.04
@@ -71,7 +110,7 @@ jobs:
           node-version: 16
           cache: "npm"
       - name: install dependencies
-        run: npm install
+        run: npm ci
       - name: build project
         run: npm run build
       - name: build fuzzer
@@ -84,6 +123,7 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v3
+      # Build with node.js 16
       - name: node
         uses: actions/setup-node@v3
         with:
@@ -93,12 +133,46 @@ jobs:
         run: cd end-to-end && ./package-jazzer-js.sh
       - name: build example
         run: cd end-to-end && npm install --save-dev *.tgz && npm run build
+
+      # Run with different node.js versions
+      # all in one job to avoid rebuilding
+      - name: "node 14"
+        uses: actions/setup-node@v3
+        with:
+          node-version: 14
+          cache: "npm"
+      - name: run tests
+        run: cd end-to-end && npx jest
+
+      - name: "node 16"
+        uses: actions/setup-node@v3
+        with:
+          node-version: 16
+          cache: "npm"
+      - name: run tests
+        run: cd end-to-end && npx jest
+
+      - name: "node 18"
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: "npm"
+      - name: run tests
+        run: cd end-to-end && npx jest
+
+      - name: "node 20"
+        uses: actions/setup-node@v3
+        with:
+          node-version: 20
+          cache: "npm"
       - name: run tests
         run: cd end-to-end && npx jest
+
   auto-merge:
     needs:
       - linting
       - unit_tests
+      - examples
       - fuzz_tests
       - end-to-end
     permissions:
diff --git a/README.md b/README.md
index 0e7ff52fb..1ac26d5e6 100644
--- a/README.md
+++ b/README.md
@@ -34,12 +34,6 @@ Jazzer.js is a coverage-guided, in-process fuzzer for the
 [libFuzzer](https://llvm.org/docs/LibFuzzer.html) and brings many of its
 instrumentation-powered mutation features to the JavaScript ecosystem.
 
-Jazzer.js currently supports the following platforms:
-
-- Linux x86_64
-- macOS x86_64 and arm64
-- Windows x86_64
-
 ## Quickstart
 
 To use Jazzer.js in your own project follow these few simple steps:
@@ -143,6 +137,15 @@ own projects. If you are just getting started, this might be helpful.
 
 You can watch the recording [here](https://youtu.be/KyIhxEiNnfc).
 
+## Supported Architectures
+
+Jazzer.js supports Node.js LTS versions on the following platforms, other
+versions are best effort only:
+
+- Linux x86_64
+- macOS x86_64 and arm64
+- Windows x86_64
+
 ## Credit
 
 Jazzer.js is inspired by its namesake
diff --git a/package.json b/package.json
index 8621c28f8..ddeecc44a 100644
--- a/package.json
+++ b/package.json
@@ -22,12 +22,15 @@
 		"clean": "rimraf -g **/node_modules **/tests/**/package-lock.json **/examples/**/package-lock.json **/dist **/coverage packages/fuzzer/build packages/fuzzer/prebuilds",
 		"compile:watch": "tsc -b tsconfig.build.json --incremental --pretty --watch",
 		"test": "run-script-os",
-		"test:jest": "jest && npm run test --ws --if-present",
-		"test:coverage": "jest --coverage",
 		"test:default": "npm run test:jest",
-		"test:linux:darwin": "npm run test:jest && cd examples && sh ../scripts/run_all.sh dryRun && cd ../tests && sh ../scripts/run_all.sh fuzz",
-		"test:win32": "npm run test:jest && cd examples && ..\\scripts\\run_all.bat dryRun && cd ..\\tests && ..\\scripts\\run_all.bat fuzz",
-		"test:watch": "jest --watch",
+		"test:linux:darwin": "npm run test:jest && cd tests && sh ../scripts/run_all.sh fuzz",
+		"test:win32": "npm run test:jest && cd tests && ..\\scripts\\run_all.bat fuzz",
+		"test:jest": "jest && npm run test --ws --if-present",
+		"test:jest:coverage": "jest --coverage",
+		"test:jest:watch": "jest --watch",
+		"example": "run-script-os",
+		"example:linux:darwin": "cd examples && sh ../scripts/run_all.sh dryRun",
+		"example:win32": "cd examples && ..\\scripts\\run_all.bat dryRun",
 		"lint": "eslint . && npm run lint --ws --if-present",
 		"lint:fix": "eslint . --fix && npm run lint:fix --ws --if-present",
 		"format": "prettier --check . && npm run format --ws --if-present",
diff --git a/packages/core/finding.test.ts b/packages/core/finding.test.ts
index 217fa18c4..618c65591 100644
--- a/packages/core/finding.test.ts
+++ b/packages/core/finding.test.ts
@@ -17,6 +17,7 @@
 import { sep } from "path";
 
 import { Finding, printFinding } from "./finding";
+import { replaceAll } from "./utils";
 
 describe("Finding", () => {
 	it("print a cleaned up finding", () => {
@@ -92,5 +93,5 @@ function mockPrinter() {
 }
 
 function withSystemSeparator(text: string): string {
-	return text.replaceAll(/\//g, sep);
+	return replaceAll(text, /\//g, sep);
 }
diff --git a/packages/core/options.ts b/packages/core/options.ts
index 57809435a..74532dbc1 100644
--- a/packages/core/options.ts
+++ b/packages/core/options.ts
@@ -19,6 +19,7 @@ import fs from "fs";
 import * as tmp from "tmp";
 
 import { useDictionaryByParams } from "./dictionary";
+import { replaceAll } from "./utils";
 
 /**
  * Jazzer.js options structure expected by the fuzzer.
@@ -86,12 +87,11 @@ export const defaultOptions: Options = Object.freeze({
 
 export type KeyFormatSource = (key: string) => string;
 export const fromCamelCase: KeyFormatSource = (key: string): string => key;
+
 export const fromSnakeCase: KeyFormatSource = (key: string): string => {
-	return key
-		.toLowerCase()
-		.replaceAll(/(_[a-z0-9])/g, (group) =>
-			group.toUpperCase().replace("_", ""),
-		);
+	return replaceAll(key.toLowerCase(), /(_[a-z0-9])/g, (group) =>
+		group.toUpperCase().replace("_", ""),
+	);
 };
 export const fromSnakeCaseWithPrefix: (prefix: string) => KeyFormatSource = (
 	prefix: string,
@@ -201,12 +201,14 @@ function mergeOptions(
 ): Options {
 	// Deep close the default options to avoid mutation.
 	const options: Options = JSON.parse(JSON.stringify(defaults));
-	if (!input || typeof input !== "object") {
+	if (!options || !input || typeof input !== "object") {
 		return options;
 	}
 	Object.keys(input as object).forEach((key) => {
 		const transformedKey = transformKey(key);
-		if (!Object.hasOwn(options, transformedKey)) {
+		// Use hasOwnProperty to still support node v14.
+		// eslint-disable-next-line no-prototype-builtins
+		if (!(options as object).hasOwnProperty(transformedKey)) {
 			if (errorOnUnknown) {
 				throw new Error(`Unknown Jazzer.js option '${key}'`);
 			}
diff --git a/packages/core/utils.ts b/packages/core/utils.ts
index 173b36ea6..5fcaf19ce 100644
--- a/packages/core/utils.ts
+++ b/packages/core/utils.ts
@@ -27,6 +27,22 @@ export async function importModule(name: string): Promise<FuzzModule | void> {
 	return import(name);
 }
 
+export function replaceAll(
+	text: string,
+	pattern: RegExp,
+	replacer: string | ((substring: string) => string),
+): string {
+	// Don't use replaceAll to support node v14.
+	let previous = text;
+	let current = previous;
+	do {
+		previous = current;
+		// Without explicit cast TS can not figure out that both types of replacer are valid.
+		current = previous.replace(pattern, replacer as string);
+	} while (current !== previous);
+	return current;
+}
+
 export function ensureFilepath(filePath: string): string {
 	if (!filePath || filePath.length === 0) {
 		throw Error("Empty filepath provided");
diff --git a/tsconfig.json b/tsconfig.json
index beb467a81..87a9097fd 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,6 @@
 {
 	"compilerOptions": {
-		"target": "ES2022",
+		"target": "ES2020",
 		"module": "NodeNext",
 		"baseUrl": "./",
 		"allowJs": true,