diff --git a/README.md b/README.md
index ffc0f5d..0b1b911 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ Provides the administrative areas data of Indonesia (province, regency, district
 [![npm version](https://img.shields.io/npm/v/idn-area-data.svg)](https://www.npmjs.com/package/idn-area-data)
 [![npm downloads](https://img.shields.io/npm/dm/idn-area-data.svg)](https://www.npmjs.com/package/idn-area-data)
 [![GitHub license](https://img.shields.io/github/license/fityannugroho/idn-area-data.svg)](LICENSE)
+[![install size](https://packagephobia.com/badge?p=idn-area-data)](https://packagephobia.com/result?p=idn-area-data)
 
 ## Prerequisite
 
diff --git a/package-lock.json b/package-lock.json
index 04ba012..548bf61 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "idn-area-data",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "idn-area-data",
-      "version": "3.1.0",
+      "version": "3.1.1",
       "license": "MIT",
       "dependencies": {
         "papaparse": "^5.4.1"
diff --git a/package.json b/package.json
index a9cb757..3aaa11e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "idn-area-data",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Indonesia administrative area data, based on the latest regulation",
   "type": "module",
   "main": "lib/index.js",