diff --git a/.github/workflows/automerge.yml b/.github/workflows/automerge.yml
index 172fbd7..650a5af 100644
--- a/.github/workflows/automerge.yml
+++ b/.github/workflows/automerge.yml
@@ -1,4 +1,5 @@
-name: "Automerge"
+name: Automerge
+
 on:
   workflow_run:
     workflows:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1927747..3bd176b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Removed
 
+## [1.9.1] - 2021-12-04
+
+### Added
+
+### Changed
+
+- Add support to `NODE_PATH` on `isPackageInstalled`
+
+### Fixed
+
+### Removed
+
 ## [1.9.0] - 2021-11-18
 
 ### Added
diff --git a/jest.config.js b/jest.config.js
index 1390ee2..7c7be42 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -12,7 +12,6 @@ module.exports = {
 		"**/*.ts",
 		"!./index.ts",
 		"!./lib/get-root-path/index.ts",
-		"!./lib/is-package-installed/index.ts",
 	],
 	coverageDirectory: "../coverage",
 	testEnvironment: "node",
diff --git a/package.json b/package.json
index 18af19e..c0ef183 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "@techmmunity/utils",
-	"version": "1.9.0",
+	"version": "1.9.1",
 	"main": "index.js",
 	"types": "index.d.ts",
 	"license": "Apache-2.0",
diff --git a/src/lib/is-package-installed/index.ts b/src/lib/is-package-installed/index.ts
index ad37244..a15351c 100644
--- a/src/lib/is-package-installed/index.ts
+++ b/src/lib/is-package-installed/index.ts
@@ -11,5 +11,11 @@ import { getRootPath } from "../get-root-path";
 export const isPackageInstalled = (packageName: string) => {
 	const { existsSync } = require("fs");
 
-	return existsSync(getRootPath(`node_modules/${packageName}`));
+	const pathsToTry = [
+		getRootPath(`node_modules/${packageName}`),
+		process.env.NODE_PATH &&
+			getRootPath(`${process.env.NODE_PATH}/${packageName}`),
+	].filter(Boolean);
+
+	return pathsToTry.some(path => existsSync(path));
 };
diff --git a/src/tests/is-package-installed.spec.ts b/src/tests/is-package-installed.spec.ts
index d09659f..3ccd251 100644
--- a/src/tests/is-package-installed.spec.ts
+++ b/src/tests/is-package-installed.spec.ts
@@ -1,5 +1,65 @@
+/* eslint-disable sonarjs/no-identical-functions */
+
+import { isPackageInstalled } from "..";
+
 describe("isPackageInstalled", () => {
-	it.todo(
-		"it uses only node features and other functions, so this cannot be truly tested",
-	);
+	describe("With normal package", () => {
+		it("should return true if package exists", () => {
+			let result: any;
+
+			try {
+				result = isPackageInstalled("jest");
+			} catch (err: any) {
+				result = err;
+			}
+
+			expect(result).toBe(true);
+		});
+
+		it("should return false if package doesn't exists", () => {
+			let result: any;
+
+			try {
+				result = isPackageInstalled("foo");
+			} catch (err: any) {
+				result = err;
+			}
+
+			expect(result).toBe(false);
+		});
+	});
+
+	describe("With NODE_PATH", () => {
+		beforeAll(() => {
+			process.env.NODE_PATH = "src";
+		});
+
+		afterAll(() => {
+			process.env.NODE_PATH = undefined;
+		});
+
+		it("should return true if package exists", () => {
+			let result: any;
+
+			try {
+				result = isPackageInstalled("lib");
+			} catch (err: any) {
+				result = err;
+			}
+
+			expect(result).toBe(true);
+		});
+
+		it("should return false if package doesn't exists", () => {
+			let result: any;
+
+			try {
+				result = isPackageInstalled("foo");
+			} catch (err: any) {
+				result = err;
+			}
+
+			expect(result).toBe(false);
+		});
+	});
 });