diff --git a/.editorconfig b/.editorconfig
index b2654e7a..2f084445 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -7,11 +7,15 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
-max_line_length = 140
+max_line_length = 160
+quote_type = single
 
 [test/*]
 max_line_length = off
 
+[LICENSE.md]
+indent_size = off
+
 [*.md]
 max_line_length = off
 
@@ -28,3 +32,12 @@ indent_size = 2
 [LICENSE]
 indent_size = 2
 max_line_length = off
+
+[coverage/**/*]
+indent_size = off
+indent_style = off
+indent = off
+max_line_length = off
+
+[.nycrc]
+indent_style = tab
diff --git a/.eslintignore b/.eslintignore
deleted file mode 100644
index 1521c8b7..00000000
--- a/.eslintignore
+++ /dev/null
@@ -1 +0,0 @@
-dist
diff --git a/.eslintrc b/.eslintrc
index b7a87b93..3f848996 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -3,17 +3,35 @@
 
     "extends": "@ljharb",
 
+    "ignorePatterns": [
+        "dist/",
+    ],
+
     "rules": {
         "complexity": 0,
         "consistent-return": 1,
-		"func-name-matching": 0,
+        "func-name-matching": 0,
         "id-length": [2, { "min": 1, "max": 25, "properties": "never" }],
         "indent": [2, 4],
+        "max-lines-per-function": 0,
         "max-params": [2, 12],
         "max-statements": [2, 45],
+        "multiline-comment-style": 0,
         "no-continue": 1,
         "no-magic-numbers": 0,
+        "no-param-reassign": 1,
         "no-restricted-syntax": [2, "BreakStatement", "DebuggerStatement", "ForInStatement", "LabeledStatement", "WithStatement"],
-        "operator-linebreak": [2, "before"],
-    }
+    },
+
+    "overrides": [
+        {
+            "files": "test/**",
+            "rules": {
+                "max-lines-per-function": 0,
+                "max-statements": 0,
+                "no-extend-native": 0,
+                "function-paren-newline": 0,
+            },
+        },
+    ],
 }
diff --git a/.gitignore b/.gitignore
index 645ff13c..c036d926 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,6 @@ dist/*
 yarn.lock
 package-lock.json
 npm-shrinkwrap.json
+
+.nyc_output/
+coverage/
diff --git a/.npmignore b/.npmignore
index ac980d91..5fafe6be 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,4 +1,14 @@
-bower.json
-component.json
-.npmignore
-.travis.yml
+# gitignore
+npm-debug.log
+node_modules
+.DS_Store
+
+# Only apps should have lockfiles
+yarn.lock
+package-lock.json
+npm-shrinkwrap.json
+
+.nyc_output/
+coverage/
+
+.github/workflows
diff --git a/.nycrc b/.nycrc
new file mode 100644
index 00000000..1d57cabe
--- /dev/null
+++ b/.nycrc
@@ -0,0 +1,13 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"lines": 86,
+	"statements": 85.93,
+	"functions": 82.43,
+	"branches": 76.06,
+	"exclude": [
+		"coverage",
+		"dist"
+	]
+}
diff --git a/lib/stringify.js b/lib/stringify.js
index fb53ca07..0b21ca75 100644
--- a/lib/stringify.js
+++ b/lib/stringify.js
@@ -4,13 +4,13 @@ var utils = require('./utils');
 var formats = require('./formats');
 
 var arrayPrefixGenerators = {
-    brackets: function brackets(prefix) { // eslint-disable-line func-name-matching
+    brackets: function brackets(prefix) {
         return prefix + '[]';
     },
-    indices: function indices(prefix, key) { // eslint-disable-line func-name-matching
+    indices: function indices(prefix, key) {
         return prefix + '[' + key + ']';
     },
-    repeat: function repeat(prefix) { // eslint-disable-line func-name-matching
+    repeat: function repeat(prefix) {
         return prefix;
     }
 };
@@ -28,14 +28,14 @@ var defaults = {
     encode: true,
     encoder: utils.encode,
     encodeValuesOnly: false,
-    serializeDate: function serializeDate(date) { // eslint-disable-line func-name-matching
+    serializeDate: function serializeDate(date) {
         return toISO.call(date);
     },
     skipNulls: false,
     strictNullHandling: false
 };
 
-var stringify = function stringify( // eslint-disable-line func-name-matching
+var stringify = function stringify(
     object,
     prefix,
     generateArrayPrefix,
diff --git a/lib/utils.js b/lib/utils.js
index f42136ee..6592e206 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -159,6 +159,7 @@ var encode = function encode(str) {
 
         i += 1;
         c = 0x10000 + (((c & 0x3FF) << 10) | (string.charCodeAt(i) & 0x3FF));
+        /* eslint operator-linebreak: [2, "before"] */
         out += hexTable[0xF0 | (c >> 18)]
             + hexTable[0x80 | ((c >> 12) & 0x3F)]
             + hexTable[0x80 | ((c >> 6) & 0x3F)]
diff --git a/package.json b/package.json
index ed6ccf06..a3e8bda4 100644
--- a/package.json
+++ b/package.json
@@ -22,30 +22,32 @@
     "engines": {
         "node": ">=0.6"
     },
-    "dependencies": {},
     "devDependencies": {
-        "@ljharb/eslint-config": "^12.2.1",
-        "browserify": "^16.2.0",
-        "covert": "^1.1.0",
-        "editorconfig-tools": "^0.1.1",
-        "eslint": "^4.19.1",
+        "@ljharb/eslint-config": "^20.1.0",
+        "aud": "^1.1.5",
+        "browserify": "^16.5.2",
+        "eclint": "^2.8.1",
+        "eslint": "^8.6.0",
         "evalmd": "^0.0.17",
-        "iconv-lite": "^0.4.21",
+        "iconv-lite": "^0.4.24",
+        "in-publish": "^2.0.1",
         "mkdirp": "^0.5.1",
+        "nyc": "^10.3.2",
         "qs-iconv": "^1.0.4",
-        "safe-publish-latest": "^1.1.1",
+        "safe-publish-latest": "^2.0.0",
         "safer-buffer": "^2.1.2",
-        "tape": "^4.9.0"
+        "tape": "^5.4.0"
     },
     "scripts": {
-        "prepublish": "safe-publish-latest && npm run dist",
+        "prepublishOnly": "safe-publish-latest && npm run dist",
+        "prepublish": "not-in-publish || npm run prepublishOnly",
         "pretest": "npm run --silent readme && npm run --silent lint",
-        "test": "npm run --silent coverage",
-        "tests-only": "node test",
+        "test": "npm run --silent tests-only",
+        "tests-only": "nyc tape 'test/**/*.js'",
+        "posttest": "aud --production",
         "readme": "evalmd README.md",
-        "postlint": "editorconfig-tools check * lib/* test/*",
-        "lint": "eslint lib/*.js test/*.js",
-        "coverage": "covert test",
+        "postlint": "eclint check $(git ls-files | xargs find 2> /dev/null | grep -vE 'node_modules|\\.git')",
+        "lint": "eslint --ext=js,mjs .",
         "dist": "mkdirp dist && browserify --standalone Qs lib/index.js > dist/qs.js"
     },
     "license": "BSD-3-Clause"
diff --git a/test/.eslintrc b/test/.eslintrc
deleted file mode 100644
index 20175d64..00000000
--- a/test/.eslintrc
+++ /dev/null
@@ -1,15 +0,0 @@
-{
-    "rules": {
-		"array-bracket-newline": 0,
-		"array-element-newline": 0,
-		"consistent-return": 2,
-        "max-lines": 0,
-        "max-nested-callbacks": [2, 3],
-        "max-statements": 0,
-		"no-buffer-constructor": 0,
-        "no-extend-native": 0,
-        "no-magic-numbers": 0,
-		"object-curly-newline": 0,
-        "sort-keys": 0
-    }
-}
diff --git a/test/parse.js b/test/parse.js
index ce014d42..7614a287 100644
--- a/test/parse.js
+++ b/test/parse.js
@@ -523,7 +523,7 @@ test('parse()', function (t) {
 
         st.deepEqual(
             qs.parse('a[b]=c&a=toString', { plainObjects: true }),
-            { a: { b: 'c', toString: true } },
+            { __proto__: null, a: { __proto__: null, b: 'c', toString: true } },
             'can overwrite prototype with plainObjects true'
         );