diff --git a/package.json b/package.json
index c0e96098a3..85c53c4ee3 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "@hakuneko/kindlegen-binaries": "latest",
     "@logtrine/logtrine": "latest",
     "asar": "latest",
-    "electron": "6.1.7",
+    "electron": "7.1.9",
     "eslint": "latest",
     "fs-extra": "latest",
     "innosetup-compiler": "latest",
diff --git a/src/app/ElectronBootstrap.js b/src/app/ElectronBootstrap.js
index 889ca82f4f..6ee5b7261f 100644
--- a/src/app/ElectronBootstrap.js
+++ b/src/app/ElectronBootstrap.js
@@ -94,7 +94,7 @@ module.exports = class ElectronBootstrap {
                     buffer = Buffer.from(JSON.stringify(await fs.readdir(endpoint)));
                 }
                 if(stats.isFile()) {
-                    mime = endpoint.endsWith('.mjs') ? 'text/javascript' : '';
+                    mime = endpoint.endsWith('.mjs') ? 'text/javascript' : undefined;
                     buffer = await fs.readFile(endpoint);
                 }
                 callback({