diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1fda601290..630ee1cf59 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -32,3 +32,5 @@ jobs:
       run: npm run build
     - name: Test
       run: npm run test
+    - name: Upload Coverage
+      uses: codecov/codecov-action@v1
diff --git a/README.md b/README.md
index 936f904ca2..5694271040 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 **Strongly-typed official Misskey SDK for browsers/Node.js.**
 
 [![Test](https://github.com/misskey-dev/misskey.js/actions/workflows/test.yml/badge.svg)](https://github.com/misskey-dev/misskey.js/actions/workflows/test.yml)
+[![codecov](https://codecov.io/gh/misskey-dev/misskey.js/branch/develop/graph/badge.svg?token=PbrTtk3nVD)](https://codecov.io/gh/misskey-dev/misskey.js)
 
 [![NPM](https://nodei.co/npm/misskey-js.png?downloads=true&downloadRank=true&stars=true)](https://www.npmjs.com/package/misskey-js)
 
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000000..5242987213
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,2 @@
+codecov:
+  token: d55e1270-f20a-4727-aa05-2bd57793315a
diff --git a/package.json b/package.json
index e5c16b16e0..891803620b 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
 		"build": "npm run tsc",
 		"tsc": "tsc",
 		"tsd": "tsd",
-		"jest": "jest --detectOpenHandles",
+		"jest": "jest --coverage --detectOpenHandles",
 		"test": "npm run jest && npm run tsd"
 	},
 	"repository": {