diff --git a/README-(ZH).md b/README-(ZH).md
index 58871e52..6520a43f 100644
--- a/README-(ZH).md
+++ b/README-(ZH).md
@@ -3,6 +3,7 @@
 [![CI](https://github.com/bhsd-harry/wikiparser-node/actions/workflows/node.js.yml/badge.svg)](https://github.com/bhsd-harry/wikiparser-node/actions/workflows/node.js.yml)
 [![jsDelivr hits (npm)](https://img.shields.io/jsdelivr/npm/hm/wikiparser-node)](https://www.npmjs.com/package/wikiparser-node)
 [![codebeat badge](https://codebeat.co/badges/7cdd51e6-2c5d-4a22-aae1-f5e352047d54)](https://codebeat.co/projects/github-com-bhsd-harry-wikiparser-node-main)
+![Istanbul coverage](./coverage/badge.svg)
 
 # Other Languages
 
diff --git a/bin/coverage.ts b/bin/coverage.ts
index 6014b31c..c4e1b1e8 100644
--- a/bin/coverage.ts
+++ b/bin/coverage.ts
@@ -17,5 +17,15 @@ declare interface Coverage {
 
 // eslint-disable-next-line n/no-missing-require
 const {total: {statements: {pct}}}: Coverage = require('../../coverage/coverage-summary.json');
-const svg = fs.readFileSync('coverage/badge.svg', 'utf8').replace(/\b\d{2}(?=%)/gu, String(Math.round(pct)));
+const colors = ['#4c1', '#dfb317', '#e05d44'] as const;
+let color: string;
+if (pct >= 80) {
+	[color] = colors;
+} else if (pct >= 60) {
+	[, color] = colors;
+} else {
+	[,, color] = colors;
+}
+const svg = fs.readFileSync('coverage/badge.svg', 'utf8').replace(/\b\d{2}(?=%)/gu, String(Math.round(pct)))
+	.replace(new RegExp(colors.join('|'), 'u'), color);
 fs.writeFileSync('coverage/badge.svg', svg);