diff --git a/package-lock.json b/package-lock.json
index dce20b1..31a0062 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3012,7 +3012,8 @@
     "lodash.merge": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.0.tgz",
-      "integrity": "sha1-aYhLoUSsM/5plzemCG3v+t0PicU="
+      "integrity": "sha1-aYhLoUSsM/5plzemCG3v+t0PicU=",
+      "dev": true
     },
     "loose-envify": {
       "version": "1.3.1",
diff --git a/package.json b/package.json
index 127bc5d..385ad51 100644
--- a/package.json
+++ b/package.json
@@ -64,9 +64,7 @@
       "**/test/**/*"
     ]
   },
-  "dependencies": {
-    "lodash.merge": "^4.6.0"
-  },
+  "dependencies": {},
   "devDependencies": {
     "@types/lodash.merge": "^4.6.3",
     "ava": "^0.22.0",
diff --git a/src/index.ts b/src/index.ts
index 13949e7..b1d64cc 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,3 @@
-import merge = require('lodash.merge')
-
 // `partial: Partial<T> | undefined` is better than `partial?: Partial<T>` in this case.
 // I want to make sure `partial` is passed in, while it can be optional, i.e. undefined, at caller context.
 export function unpartial<T extends object>(base: T, partial: Partial<T> | undefined): T
@@ -20,12 +18,12 @@ function unpartialTrio(superBase, base, partial) {
   if (base === undefined || base === null)
     return unpartial(superBase, partial)
 
-  return merge({}, superBase, base, partial)
+  return { ...superBase, ...base, ...partial }
 }
 
 function unpartialDuo(base, partial) {
   if (partial === undefined || partial === null)
     return partial
 
-  return merge({}, base, partial)
+  return { ...base, ...partial }
 }