diff --git a/src/artifact-utils.ts b/src/artifact-utils.ts
index c43dd62d9..bf574a4ad 100644
--- a/src/artifact-utils.ts
+++ b/src/artifact-utils.ts
@@ -1,5 +1,5 @@
 import { ElectronArtifactDetails, MirrorOptions } from './types';
-import { ensureIsTruthyString } from './utils';
+import { ensureIsTruthyString, normalizeVersion } from './utils';
 
 const BASE_URL = 'https://github.com/electron/electron/releases/download/';
 const NIGHTLY_BASE_URL = 'https://github.com/electron/nightlies/releases/download/';
@@ -30,13 +30,18 @@ function mirrorVar(
   defaultValue: string,
 ): string {
   // Convert camelCase to camel_case for env var reading
-  const lowerName = name.replace(/([a-z])([A-Z])/g, (_, a, b) => `${a}_${b}`).toLowerCase();
+  const snakeName = name.replace(/([a-z])([A-Z])/g, (_, a, b) => `${a}_${b}`).toLowerCase();
 
   return (
-    process.env[`NPM_CONFIG_ELECTRON_${lowerName.toUpperCase()}`] ||
-    process.env[`npm_config_electron_${lowerName}`] ||
-    process.env[`npm_package_config_electron_${lowerName}`] ||
-    process.env[`ELECTRON_${lowerName.toUpperCase()}`] ||
+    // .npmrc
+    process.env[`npm_config_electron_${name.toLowerCase()}`] ||
+    process.env[`NPM_CONFIG_ELECTRON_${snakeName.toUpperCase()}`] ||
+    process.env[`npm_config_electron_${snakeName}`] ||
+    // package.json
+    process.env[`npm_package_config_electron_${name}`] ||
+    process.env[`npm_package_config_electron_${snakeName.toLowerCase()}`] ||
+    // env
+    process.env[`ELECTRON_${snakeName.toUpperCase()}`] ||
     options[name] ||
     defaultValue
   );
@@ -68,3 +73,7 @@ export async function getArtifactRemoteURL(details: ElectronArtifactDetails): Pr
 
   return `${base}${path}/${file}`;
 }
+
+export function getArtifactVersion(details: ElectronArtifactDetails): string {
+  return normalizeVersion(mirrorVar('customVersion', details.mirrorOptions || {}, details.version));
+}
diff --git a/src/index.ts b/src/index.ts
index 9d2a86850..a506da57b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,7 +4,7 @@ import * as path from 'path';
 import * as semver from 'semver';
 import * as sumchecker from 'sumchecker';
 
-import { getArtifactFileName, getArtifactRemoteURL } from './artifact-utils';
+import { getArtifactFileName, getArtifactRemoteURL, getArtifactVersion } from './artifact-utils';
 import {
   ElectronArtifactDetails,
   ElectronDownloadRequestOptions,
@@ -16,7 +16,6 @@ import { getDownloaderForSystem } from './downloader-resolver';
 import { initializeProxy } from './proxy';
 import {
   withTempDirectoryIn,
-  normalizeVersion,
   getHostArch,
   getNodeArch,
   ensureIsTruthyString,
@@ -61,9 +60,7 @@ export async function downloadArtifact(
   }
   ensureIsTruthyString(artifactDetails, 'version');
 
-  artifactDetails.version = normalizeVersion(
-    process.env.ELECTRON_CUSTOM_VERSION || artifactDetails.version,
-  );
+  artifactDetails.version = getArtifactVersion(artifactDetails);
   const fileName = getArtifactFileName(artifactDetails);
   const url = await getArtifactRemoteURL(artifactDetails);
   const cache = new Cache(artifactDetails.cacheRoot);
diff --git a/src/types.ts b/src/types.ts
index 561029659..438f552a6 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -27,6 +27,11 @@ export interface MirrorOptions {
    * e.g 'electron-v4.0.4-linux-x64.zip'
    */
   customFilename?: string;
+  /**
+   * The version of the asset to download,
+   * e.g '4.0.4'
+   */
+  customVersion?: string;
   /**
    * A function allowing customization of the url returned
    * from getArtifactRemoteURL().
diff --git a/test/checksums.spec.ts b/test/checksums.spec.ts
index 827fe34a1..015c77277 100644
--- a/test/checksums.spec.ts
+++ b/test/checksums.spec.ts
@@ -1,4 +1,3 @@
-import * as crypto from 'crypto';
 import * as fs from 'fs-extra';
 import * as os from 'os';
 import * as path from 'path';
diff --git a/test/index.spec.ts b/test/index.spec.ts
index f5fc9adcd..58ed8c534 100644
--- a/test/index.spec.ts
+++ b/test/index.spec.ts
@@ -215,6 +215,22 @@ describe('Public API', () => {
       process.env.ELECTRON_CUSTOM_VERSION = '';
     });
 
+    it('should download a custom version specified via mirror options', async () => {
+      const zipPath = await downloadArtifact({
+        artifactName: 'electron',
+        cacheRoot,
+        downloader,
+        platform: 'darwin',
+        arch: 'x64',
+        version: '2.0.3',
+        mirrorOptions: {
+          customVersion: '2.0.10',
+        },
+      });
+      expect(typeof zipPath).toEqual('string');
+      expect(path.basename(zipPath)).toMatchInlineSnapshot(`"electron-v2.0.10-darwin-x64.zip"`);
+    });
+
     describe('sumchecker', () => {
       beforeEach(() => {
         jest.clearAllMocks();