diff --git a/packages/node-resolve/package.json b/packages/node-resolve/package.json
index f06f248d0..36edd99e0 100644
--- a/packages/node-resolve/package.json
+++ b/packages/node-resolve/package.json
@@ -64,7 +64,6 @@
   "dependencies": {
     "@rollup/pluginutils": "^5.0.1",
     "@types/resolve": "1.20.2",
-    "deepmerge": "^4.2.2",
     "is-module": "^1.0.0",
     "resolve": "^1.22.1"
   },
diff --git a/packages/node-resolve/src/index.js b/packages/node-resolve/src/index.js
index 1ed3989e4..aea29e779 100644
--- a/packages/node-resolve/src/index.js
+++ b/packages/node-resolve/src/index.js
@@ -3,7 +3,6 @@ import { dirname, normalize, resolve, sep } from 'path';
 
 import { builtinModules } from 'module';
 
-import deepMerge from 'deepmerge';
 import isModule from 'is-module';
 
 import { version, peerDependencies } from '../package.json';
@@ -27,6 +26,19 @@ const deepFreeze = (object) => {
 
   return object;
 };
+const deepClone = (object) => {
+  const result = Object.assign({}, object);
+
+  for (const [key, value] of Object.entries(result)) {
+    if (Array.isArray(value)) {
+      result[key] = Array.from(value);
+    } else if (typeof value === 'object') {
+      result[key] = deepClone(value);
+    }
+  }
+
+  return result;
+};
 
 const baseConditions = ['default', 'module'];
 const baseConditionsEsm = [...baseConditions, 'import'];
@@ -45,7 +57,7 @@ const defaults = {
 };
 const nodeImportPrefix = /^node:/;
 
-export const DEFAULTS = deepFreeze(deepMerge({}, defaults));
+export const DEFAULTS = deepFreeze(deepClone(defaults));
 
 export function nodeResolve(opts = {}) {
   const { warnings } = handleDeprecatedOptions(opts);
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 8cbba389d..d8145b011 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -511,9 +511,6 @@ importers:
       '@types/resolve':
         specifier: 1.20.2
         version: 1.20.2
-      deepmerge:
-        specifier: ^4.2.2
-        version: 4.2.2
       is-module:
         specifier: ^1.0.0
         version: 1.0.0