diff --git a/.travis.yml b/.travis.yml
index ea3ec10..1803e3f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,17 +5,9 @@ os:
 language: node_js
 node_js:
   - node
-  - '10'
-  - '9'
-  - '8'
-  - '7'
-  - '6'
-  - '5'
-  - '4'
-  - '0.12'
-  - '0.10'
+  - '14'
+  - '12'
 matrix:
   fast_finish: true
   allow_failures:
     - node_js: 'node'
-    - node_js: '0.8'
diff --git a/index.js b/index.js
index 08db87a..f721e05 100644
--- a/index.js
+++ b/index.js
@@ -1,7 +1,7 @@
 /*!
  * merge-deep <https://github.com/jonschlinkert/merge-deep>
  *
- * Copyright (c) 2014-2015, Jon Schlinkert.
+ * Copyright (c) 2014-2021, Jon Schlinkert.
  * Licensed under the MIT License.
  */
 
@@ -55,7 +55,7 @@ function hasOwn(obj, key) {
 }
 
 function isObject(val) {
-  return typeOf(val) === 'object' || typeOf(val) === 'function';
+  return typeOf(val) === 'object' || typeOf(val) === 'function' || typeOf(val) === "regexp" || typeOf(val) === "date";
 }
 
 function isValidKey(key) {
diff --git a/package.json b/package.json
index ad300ff..7fd0afe 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "merge-deep",
   "description": "Recursively merge values in a javascript object.",
-  "version": "3.0.3",
+  "version": "4.0.0",
   "homepage": "https://github.com/jonschlinkert/merge-deep",
   "author": "Jon Schlinkert (https://github.com/jonschlinkert)",
   "repository": "jonschlinkert/merge-deep",
@@ -14,15 +14,15 @@
   ],
   "main": "index.js",
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=12.0.0"
   },
   "scripts": {
     "test": "mocha"
   },
   "dependencies": {
     "arr-union": "^3.1.0",
-    "clone-deep": "^0.2.4",
-    "kind-of": "^3.0.2"
+    "clone-deep": "^4.0.1",
+    "kind-of": "^6.0.3"
   },
   "devDependencies": {
     "gulp-format-md": "^0.1.7",