diff --git a/__tests__/src/eventHandlers-test.js b/__tests__/src/eventHandlers-test.js
index a3899e9..c83a503 100644
--- a/__tests__/src/eventHandlers-test.js
+++ b/__tests__/src/eventHandlers-test.js
@@ -1,6 +1,5 @@
 /* eslint-env mocha */
 import assert from 'assert';
-import includes from 'array-includes';
 import eventHandlers, { eventHandlersByType } from '../../src/eventHandlers';
 
 describe('eventHandlers', () => {
@@ -75,7 +74,7 @@ describe('eventHandlers', () => {
       'onAnimationEnd',
       'onAnimationIteration',
       'onTransitionEnd',
-    ].every((handlerName) => includes(eventHandlers, handlerName)));
+    ].every((handlerName) => eventHandlers.includes(handlerName)));
   });
 });
 
diff --git a/__tests__/src/getProp-parser-test.js b/__tests__/src/getProp-parser-test.js
index 531a08e..7185a36 100644
--- a/__tests__/src/getProp-parser-test.js
+++ b/__tests__/src/getProp-parser-test.js
@@ -1,7 +1,5 @@
 /* eslint-env mocha */
 import assert from 'assert';
-import entries from 'object.entries';
-import fromEntries from 'object.fromentries';
 import { getOpeningElement, setParserName, fallbackToBabylon } from '../helper';
 import getProp from '../../src/getProp';
 
@@ -172,5 +170,5 @@ function adjustLocationsRecursively(node, { startOffset, endOffset }) {
 }
 
 function mapValues(o, f) {
-  return fromEntries(entries(o).map(([k, v]) => [k, f(v)]));
+  return Object.fromEntries(Object.entries(o).map(([k, v]) => [k, f(v)]));
 }
diff --git a/package.json b/package.json
index 6ed3c13..d464df9 100644
--- a/package.json
+++ b/package.json
@@ -41,8 +41,6 @@
     "jest": "^20.0.4",
     "jest-cli": "^20.0.4",
     "npmignore": "^0.3.0",
-    "object.entries": "^1.1.6",
-    "object.fromentries": "^2.0.6",
     "rimraf": "^2.7.1",
     "safe-publish-latest": "^2.0.0"
   },
@@ -61,12 +59,6 @@
     "url": "https://github.com/jsx-eslint/jsx-ast-utils"
   },
   "license": "MIT",
-  "dependencies": {
-    "array-includes": "^3.1.6",
-    "array.prototype.flat": "^1.3.1",
-    "object.assign": "^4.1.4",
-    "object.values": "^1.1.6"
-  },
   "auto-changelog": {
     "output": "CHANGELOG.md",
     "template": "keepachangelog",
diff --git a/src/eventHandlers.js b/src/eventHandlers.js
index dff8a50..cb3a44c 100644
--- a/src/eventHandlers.js
+++ b/src/eventHandlers.js
@@ -1,6 +1,3 @@
-import flat from 'array.prototype.flat';
-import values from 'object.values';
-
 /**
  * Common event handlers for JSX element event binding.
  */
@@ -105,6 +102,6 @@ const eventHandlersByType = {
   ],
 };
 
-export default flat(values(eventHandlersByType));
+export default Object.values(eventHandlersByType).flat();
 
 export { eventHandlersByType };
diff --git a/src/values/expressions/ObjectExpression.js b/src/values/expressions/ObjectExpression.js
index 383b569..d9bd5af 100644
--- a/src/values/expressions/ObjectExpression.js
+++ b/src/values/expressions/ObjectExpression.js
@@ -1,5 +1,3 @@
-import assign from 'object.assign';
-
 /**
  * Extractor function for an ObjectExpression type value node.
  * An object expression is using {}.
@@ -13,10 +11,10 @@ export default function extractValueFromObjectExpression(value) {
     // Support types: SpreadProperty and ExperimentalSpreadProperty
     if (/^(?:Experimental)?Spread(?:Property|Element)$/.test(property.type)) {
       if (property.argument.type === 'ObjectExpression') {
-        return assign({}, obj, extractValueFromObjectExpression(property.argument));
+        return { ...obj, ...extractValueFromObjectExpression(property.argument) };
       }
     } else {
-      return assign({}, obj, { [getValue(property.key)]: getValue(property.value) });
+      return { ...obj, [getValue(property.key)]: getValue(property.value) };
     }
     return obj;
   }, {});