diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1d2f6d6..0d93db4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,11 +47,11 @@ jobs:
         run: yarn install
       - name: Run tests
         run: yarn cover
-      - name: Coveralls
-        uses: coverallsapp/github-action@master
-        with:
-          github-token: ${{ secrets.github_token }}
-          parallel: true
+      - name: Codecov
+        run: curl -s https://codecov.io/bash | bash -s -- -t $CODECOV_TOKEN -f $COVERAGE_FILE
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+          COVERAGE_FILE: ./coverage/lcov.info
       - uses: 8398a7/action-slack@v1
         with:
           type: failure
@@ -60,20 +60,9 @@ jobs:
           SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
         if: failure()
 
-  coverallsFinished:
-    name: Coveralls Finished
-    needs: jest
-    runs-on: ubuntu-latest
-    steps:
-      - name: Coveralls Finished
-        uses: coverallsapp/github-action@master
-        with:
-          github-token: ${{ secrets.github_token }}
-          parallel-finished: true
-
   slack:
     name: Slack
-    needs: coverallsFinished
+    needs: jest
     runs-on: ubuntu-latest
     steps:
       - uses: 8398a7/action-slack@v1
diff --git a/README.ja.md b/README.ja.md
index b4a243e..5db420d 100644
--- a/README.ja.md
+++ b/README.ja.md
@@ -3,7 +3,7 @@
 [![npm version](https://badge.fury.io/js/jquery.marker-animation.svg)](https://badge.fury.io/js/jquery.marker-animation)
 [![Build Status](https://github.com/technote-space/jquery.marker-animation/workflows/Build/badge.svg)](https://github.com/technote-space/jquery.marker-animation/actions)
 [![Build Status](https://travis-ci.com/technote-space/jquery.marker-animation.svg?branch=master)](https://travis-ci.com/technote-space/jquery.marker-animation)
-[![Coverage Status](https://coveralls.io/repos/github/technote-space/jquery.marker-animation/badge.svg?branch=master)](https://coveralls.io/github/technote-space/jquery.marker-animation?branch=master)
+[![codecov](https://codecov.io/gh/technote-space/jquery.marker-animation/branch/master/graph/badge.svg)](https://codecov.io/gh/technote-space/jquery.marker-animation)
 [![CodeFactor](https://www.codefactor.io/repository/github/technote-space/jquery.marker-animation/badge)](https://www.codefactor.io/repository/github/technote-space/jquery.marker-animation)
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://github.com/technote-space/jquery.marker-animation/blob/master/LICENSE)
 
@@ -144,4 +144,4 @@ $('.marker-animation').markerAnimation({
 * 太文字ではない
 * ２秒遅れてアニメーション開始
 
-が設定されます。
\ No newline at end of file
+が設定されます。
diff --git a/README.md b/README.md
index c8cba30..07449a5 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 [![npm version](https://badge.fury.io/js/jquery.marker-animation.svg)](https://badge.fury.io/js/jquery.marker-animation)
 [![Build Status](https://github.com/technote-space/jquery.marker-animation/workflows/Build/badge.svg)](https://github.com/technote-space/jquery.marker-animation/actions)
 [![Build Status](https://travis-ci.com/technote-space/jquery.marker-animation.svg?branch=master)](https://travis-ci.com/technote-space/jquery.marker-animation)
-[![Coverage Status](https://coveralls.io/repos/github/technote-space/jquery.marker-animation/badge.svg?branch=master)](https://coveralls.io/github/technote-space/jquery.marker-animation?branch=master)
+[![codecov](https://codecov.io/gh/technote-space/jquery.marker-animation/branch/master/graph/badge.svg)](https://codecov.io/gh/technote-space/jquery.marker-animation)
 [![CodeFactor](https://www.codefactor.io/repository/github/technote-space/jquery.marker-animation/badge)](https://www.codefactor.io/repository/github/technote-space/jquery.marker-animation)
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://github.com/technote-space/jquery.marker-animation/blob/master/LICENSE)