diff --git a/bin/extra-lint.js b/bin/extra-lint.js
index 30b9c9edf6..18a2915a01 100755
--- a/bin/extra-lint.js
+++ b/bin/extra-lint.js
@@ -35,7 +35,7 @@ files.forEach(function (file) {
     }
 
     if (error) {
-      let name = path.basename(file)
+      const name = path.basename(file)
       console.log('%s:%d - %s:\n%s', name, i + 1, error, line)
       hasErrors = true
     }
diff --git a/src/main/index.js b/src/main/index.js
index f3e88d2bdb..2b61eeaf5e 100644
--- a/src/main/index.js
+++ b/src/main/index.js
@@ -192,7 +192,7 @@ function sliceArgv (argv) {
 }
 
 function processArgv (argv) {
-  let torrentIds = []
+  const torrentIds = []
   argv.forEach(function (arg) {
     if (arg === '-n' || arg === '-o' || arg === '-u') {
       // Critical path: Only load the 'dialog' package if it is needed
diff --git a/src/renderer/controllers/torrent-list-controller.js b/src/renderer/controllers/torrent-list-controller.js
index f726c800f2..e32cfcbc0d 100644
--- a/src/renderer/controllers/torrent-list-controller.js
+++ b/src/renderer/controllers/torrent-list-controller.js
@@ -318,7 +318,7 @@ module.exports = class TorrentListController {
 function findFilesRecursive (paths, cb_) {
   if (paths.length > 1) {
     let numComplete = 0
-    let ret = []
+    const ret = []
     paths.forEach(function (path) {
       findFilesRecursive([path], function (fileObjs) {
         ret.push(...fileObjs)
diff --git a/src/renderer/lib/state.js b/src/renderer/lib/state.js
index e42bf8f222..0a5547721e 100644
--- a/src/renderer/lib/state.js
+++ b/src/renderer/lib/state.js
@@ -236,7 +236,7 @@ function saveImmediate (state, cb) {
     .filter((x) => x.infoHash)
     .map(function (x) {
       const torrent = {}
-      for (let key in x) {
+      for (const key in x) {
         if (key === 'progress' || key === 'torrentKey') {
           continue // Don't save progress info or key for the webtorrent process
         }
diff --git a/src/renderer/lib/telemetry.js b/src/renderer/lib/telemetry.js
index 31e2130364..d0e400a209 100644
--- a/src/renderer/lib/telemetry.js
+++ b/src/renderer/lib/telemetry.js
@@ -98,7 +98,7 @@ function getSystemInfo () {
 function getTorrentStats (state) {
   const count = state.saved.torrents.length
   let sizeMB = 0
-  let byStatus = {
+  const byStatus = {
     new: { count: 0, sizeMB: 0 },
     downloading: { count: 0, sizeMB: 0 },
     seeding: { count: 0, sizeMB: 0 },
diff --git a/src/renderer/lib/torrent-poster.js b/src/renderer/lib/torrent-poster.js
index b67d66f534..b4d72869d5 100644
--- a/src/renderer/lib/torrent-poster.js
+++ b/src/renderer/lib/torrent-poster.js
@@ -98,7 +98,7 @@ function scoreAudioCoverFile (imgFile) {
     spectrogram: -80
   }
 
-  for (let keyword in relevanceScore) {
+  for (const keyword in relevanceScore) {
     if (fileName === keyword) {
       return relevanceScore[keyword]
     }
diff --git a/src/renderer/main.js b/src/renderer/main.js
index 9beab04c85..ae333be7d2 100644
--- a/src/renderer/main.js
+++ b/src/renderer/main.js
@@ -5,7 +5,7 @@
  *   actually used because auto-prefixing is disabled with
  *   `darkBaseTheme.userAgent = false`. Return a fake object.
  */
-let Module = require('module')
+const Module = require('module')
 const _require = Module.prototype.require
 Module.prototype.require = function (id) {
   if (id === 'inline-style-prefixer') return {}
diff --git a/src/renderer/pages/player-page.js b/src/renderer/pages/player-page.js
index 5996241bd7..6cb1f86339 100644
--- a/src/renderer/pages/player-page.js
+++ b/src/renderer/pages/player-page.js
@@ -734,14 +734,14 @@ function formatTime (time, total) {
     return '0:00'
   }
 
-  let totalHours = Math.floor(total / 3600)
-  let totalMinutes = Math.floor(total % 3600 / 60)
-  let hours = Math.floor(time / 3600)
+  const totalHours = Math.floor(total / 3600)
+  const totalMinutes = Math.floor(total % 3600 / 60)
+  const hours = Math.floor(time / 3600)
   let minutes = Math.floor(time % 3600 / 60)
   if (totalMinutes > 9) {
     minutes = zeroFill(2, minutes)
   }
-  let seconds = zeroFill(2, Math.floor(time % 60))
+  const seconds = zeroFill(2, Math.floor(time % 60))
 
   return (totalHours > 0 ? hours + ':' : '') + minutes + ':' + seconds
 }