diff --git a/package.json b/package.json
index d942fb30..89c1ea0d 100644
--- a/package.json
+++ b/package.json
@@ -57,9 +57,6 @@
     "react": "^16.8",
     "react-native": ">=0.59"
   },
-  "dependencies": {
-    "deep-assign": "^3.0.0"
-  },
   "devDependencies": {
     "@babel/core": "^7.6.2",
     "@babel/runtime": "^7.6.2",
diff --git a/src/AsyncStorage.js b/src/AsyncStorage.js
index 020d16ef..db88a4bf 100644
--- a/src/AsyncStorage.js
+++ b/src/AsyncStorage.js
@@ -8,13 +8,22 @@
  * @flow
  */
 
-import merge from 'deep-assign';
+const merge = (target = {}, source = {}) => {
+  for (const key of Object.keys(source)) {
+    if (source[key] instanceof Object) {
+      Object.assign(source[key], merge(target[key], source[key]));
+    } else {
+      source[key] = target[key] || source[key];
+    }
+  }
+  return Object.assign(target, source);
+};
 
 const mergeLocalStorageItem = (key, value) => {
   const oldValue = window.localStorage.getItem(key);
   const oldObject = JSON.parse(oldValue);
   const newObject = JSON.parse(value);
-  const nextValue = JSON.stringify(merge({}, oldObject, newObject));
+  const nextValue = JSON.stringify(merge(oldObject, newObject));
   window.localStorage.setItem(key, nextValue);
 };