diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ed60f7b..ffbdf42a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [3.4.1](https://github.com/ybiquitous/npm-audit-fix-action/compare/v3.4.0...v3.4.1) (2021-10-16)
+
+### Bug Fixes
+
+- remove duplicate lines in commit body ([#507](https://github.com/ybiquitous/npm-audit-fix-action/issues/507)) ([242a4c2](https://github.com/ybiquitous/npm-audit-fix-action/commit/242a4c2c2bccb1f74ce197980f2149269e8a1553))
+
+## [3.4.0](https://github.com/ybiquitous/npm-audit-fix-action/compare/v3.3.0...v3.4.0) (2021-10-16)
+
+### Features
+
+- **deps:** bump npm from 7 to 8 ([#506](https://github.com/ybiquitous/npm-audit-fix-action/issues/506)) ([5f38573](https://github.com/ybiquitous/npm-audit-fix-action/commit/5f3857374aae4bed1dfea86aa7b1fc6e3a0652f0))
+
 ## [3.3.0](https://github.com/ybiquitous/npm-audit-fix-action/compare/v3.2.5...v3.3.0) (2021-10-11)
 
 ### Features
diff --git a/dist/index.cjs b/dist/index.cjs
index 65f69031..3ca421e8 100644
--- a/dist/index.cjs
+++ b/dist/index.cjs
@@ -9277,6 +9277,7 @@ async function auditFix() {
  * @returns {string}
  */
 function buildCommitBody(report) {
+  /** @type {string[]} */
   const lines = [];
 
   lines.push("Summary:");
@@ -9287,11 +9288,15 @@ function buildCommitBody(report) {
   lines.push("");
   if (report.updated.length > 0) {
     lines.push("Fixed vulnerabilities:");
+
+    /** @type {Set<string>} */
+    const vulnerabilities = new Set();
     report.updated.forEach(({ name, severity, title, url }) => {
       if (severity != null && title != null && url != null) {
-        lines.push(`- ${name}: "${title}" (${url})`);
+        vulnerabilities.add(`- ${name}: "${title}" (${url})`);
       }
     });
+    lines.push(...Array.from(vulnerabilities));
   } else {
     lines.push("No fixed vulnerabilities.");
   }
@@ -9302,7 +9307,7 @@ function buildCommitBody(report) {
 ;// CONCATENATED MODULE: ./lib/constants.js
 const PACKAGE_NAME = "ybiquitous/npm-audit-fix-action";
 const PACKAGE_URL = "https://github.com/ybiquitous/npm-audit-fix-action";
-const NPM_VERSION = "7";
+const NPM_VERSION = "8";
 
 ;// CONCATENATED MODULE: ./lib/buildPullRequestBody.js
 
diff --git a/lib/buildCommitBody.js b/lib/buildCommitBody.js
index b5c60533..1cf6c3be 100644
--- a/lib/buildCommitBody.js
+++ b/lib/buildCommitBody.js
@@ -3,6 +3,7 @@
  * @returns {string}
  */
 export default function buildCommitBody(report) {
+  /** @type {string[]} */
   const lines = [];
 
   lines.push("Summary:");
@@ -13,11 +14,15 @@ export default function buildCommitBody(report) {
   lines.push("");
   if (report.updated.length > 0) {
     lines.push("Fixed vulnerabilities:");
+
+    /** @type {Set<string>} */
+    const vulnerabilities = new Set();
     report.updated.forEach(({ name, severity, title, url }) => {
       if (severity != null && title != null && url != null) {
-        lines.push(`- ${name}: "${title}" (${url})`);
+        vulnerabilities.add(`- ${name}: "${title}" (${url})`);
       }
     });
+    lines.push(...Array.from(vulnerabilities));
   } else {
     lines.push("No fixed vulnerabilities.");
   }
diff --git a/lib/constants.js b/lib/constants.js
index 460b3532..81fb6def 100644
--- a/lib/constants.js
+++ b/lib/constants.js
@@ -1,3 +1,3 @@
 export const PACKAGE_NAME = "ybiquitous/npm-audit-fix-action";
 export const PACKAGE_URL = "https://github.com/ybiquitous/npm-audit-fix-action";
-export const NPM_VERSION = "7";
+export const NPM_VERSION = "8";
diff --git a/package-lock.json b/package-lock.json
index 2b1f31da..d2df4b2f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "npm-audit-fix-action",
-  "version": "3.3.0",
+  "version": "3.4.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "npm-audit-fix-action",
-      "version": "3.3.0",
+      "version": "3.4.1",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.6.0",
diff --git a/package.json b/package.json
index 187e05d3..f34529f5 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "npm-audit-fix-action",
-  "version": "3.3.0",
+  "version": "3.4.1",
   "description": "A GitHub Action for `npm audit fix`",
   "author": "Masafumi Koba",
   "license": "MIT",
@@ -13,7 +13,7 @@
   "repository": "ybiquitous/npm-audit-fix-action",
   "engines": {
     "node": ">=12.20.0",
-    "npm": ">=7 <9"
+    "npm": ">=8"
   },
   "type": "module",
   "main": "lib/index.js",