diff --git a/index.js b/index.js
index 5f89c59c1..9ee458584 100755
--- a/index.js
+++ b/index.js
@@ -9,7 +9,7 @@ const tag = require('./lib/lifecycles/tag')
 const { resolveUpdaterObjectFromArgument } = require('./lib/updaters')
 
 module.exports = function standardVersion (argv) {
-  let defaults = require('./defaults')
+  const defaults = require('./defaults')
   /**
    * `--message` (`-m`) support will be removed in the next major version.
    */
diff --git a/lib/updaters/types/json.js b/lib/updaters/types/json.js
index 5e6924cd1..4494aab76 100644
--- a/lib/updaters/types/json.js
+++ b/lib/updaters/types/json.js
@@ -8,8 +8,8 @@ module.exports.readVersion = function (contents) {
 
 module.exports.writeVersion = function (contents, version) {
   const json = JSON.parse(contents)
-  let indent = detectIndent(contents).indent
-  let newline = detectNewline(contents)
+  const indent = detectIndent(contents).indent
+  const newline = detectNewline(contents)
   json.version = version
   return stringifyPackage(json, indent, newline)
 }