diff --git a/__tests__/get-os.test.js b/__tests__/get-os.test.js
new file mode 100644
index 0000000..3254a98
--- /dev/null
+++ b/__tests__/get-os.test.js
@@ -0,0 +1,17 @@
+const getOS = require("../lib/get-os");
+
+describe("getOS", () => {
+  test("test", () => {
+    expect(getOS("linux")).toBe("Linux");
+    expect(getOS("darwin")).toBe("macOS");
+  });
+
+  test("test exception", () => {
+    expect(() => {
+      getOS("win32");
+    }).toThrowError("Windows is not supported");
+    expect(() => {
+      getOS("centos");
+    }).toThrowError("centos is not supported");
+  });
+});
diff --git a/__tests__/index.test.js b/__tests__/index.test.js
deleted file mode 100644
index 9725109..0000000
--- a/__tests__/index.test.js
+++ /dev/null
@@ -1,23 +0,0 @@
-const wait = require('./wait');
-const process = require('process');
-const cp = require('child_process');
-const path = require('path');
-
-test('throws invalid number', async() => {
-    await expect(wait('foo')).rejects.toThrow('milleseconds not a number');
-});
-
-test('wait 500 ms', async() => {
-    const start = new Date();
-    await wait(500);
-    const end = new Date();
-    var delta = Math.abs(end - start);
-    expect(delta).toBeGreaterThan(450);
-});
-
-// shows how the runner will run a javascript action with env / stdout protocol
-test('test runs', () => {
-    process.env['INPUT_MILLISECONDS'] = 500;
-    const ip = path.join(__dirname, 'index.js');
-    console.log(cp.execSync(`node ${ip}`).toString());
-})
diff --git a/lib/get-os.js b/lib/get-os.js
new file mode 100644
index 0000000..bd076c3
--- /dev/null
+++ b/lib/get-os.js
@@ -0,0 +1,13 @@
+function getOS(platform) {
+  if (platform === "linux") {
+    return "Linux";
+  } else if (platform === "darwin") {
+    return "macOS";
+  } else if (platform === "win32") {
+    throw new Error("Windows is not supported");
+  } else {
+    throw new Error(`${platform} is not supported`);
+  }
+}
+
+module.exports = getOS;
diff --git a/lib/index.js b/lib/index.js
index d90048a..8031f90 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -2,6 +2,7 @@ const core = require("@actions/core");
 const tc = require("@actions/tool-cache");
 const io = require("@actions/io");
 const exec = require("@actions/exec");
+const getOS = require("./get-os");
 const getLatestVersion = require("./get-latest-version");
 
 // most @actions toolkit packages have async methods
@@ -22,9 +23,10 @@ async function run() {
           extendedStr = "extended_";
         }
 
-        console.log(`Operating System: ${process.platform}`);
+        const osName = getOS(process.platform);
+        console.log(`Operating System: ${osName}`);
 
-        const hugoName = `hugo_${extendedStr}${hugoVersion}_Linux-64bit`;
+        const hugoName = `hugo_${extendedStr}${hugoVersion}_${osName}-64bit`;
         core.debug(`hugoName: ${hugoName}`);
 
         const hugoURL = `https://github.com/gohugoio/hugo/releases/download/v${hugoVersion}/${hugoName}.tar.gz`;
diff --git a/package-lock.json b/package-lock.json
index 1cd7c8b..6ce03ef 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "hugo-action",
-  "version": "0.1.0",
+  "version": "2.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {