diff --git a/.eslintrc b/.eslintrc
index 381678f..348633c 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,5 +1,8 @@
 {
   "extends": "eslint:recommended",
+  "parserOptions": {
+    "ecmaVersion": "latest"
+  },
   "env": {
     "node": true,
     "mocha": true
diff --git a/index.js b/index.js
index 080b381..16f98a0 100755
--- a/index.js
+++ b/index.js
@@ -1,11 +1,10 @@
-var _ = require("lodash");
 var pp = require("preprocess");
 var path = require("path");
 var through = require('through2');
 
 module.exports = function (options) {
-  var opts = _.merge({}, options);
-  var context = _.merge({}, process.env, opts.context);
+  var opts = Object.assign({}, options);
+  var context = Object.assign({}, process.env, opts.context);
 
   function ppStream(file, encoding, callback) {
     var contents, extension;
@@ -19,9 +18,7 @@ module.exports = function (options) {
     context.srcDir = opts.includeBase || path.dirname(file.path);
     context.NODE_ENV = context.NODE_ENV || "development";
 
-    extension = _.isEmpty(opts.extension)
-      ? getExtension(context.src)
-      : opts.extension;
+    extension = opts.extension ?? getExtension(context.src);
 
     contents = file.contents.toString("utf8");
     contents = pp.preprocess(contents, context, extension);
diff --git a/package-lock.json b/package-lock.json
index 9359d86..56335e3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,6 @@
       "version": "4.0.2",
       "license": "MIT",
       "dependencies": {
-        "lodash": "^4.17.15",
         "preprocess": "^3.0.0",
         "through2": "^4.0.2"
       },
@@ -21,7 +20,7 @@
         "vinyl": "^3.0.0"
       },
       "engines": {
-        "node": ">= 14"
+        "node": ">= 18"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
@@ -1092,11 +1091,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/lodash": {
-      "version": "4.17.21",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
-      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
-    },
     "node_modules/lodash.merge": {
       "version": "4.6.2",
       "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
diff --git a/package.json b/package.json
index bd1230e..4b5a24f 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,6 @@
   "author": "Jason Sandmeyer",
   "main": "./index.js",
   "dependencies": {
-    "lodash": "^4.17.15",
     "preprocess": "^3.0.0",
     "through2": "^4.0.2"
   },