diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9fa93a9c..aca746c8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,3 +22,8 @@ jobs:
           node-version: ${{ matrix.node-version }}
       - run: npm install
       - run: npm test
+      - run: npm run test:coverage
+      - name: codecov
+        uses: codecov/codecov-action@v3
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.gitignore b/.gitignore
index c11ba12e..cb8c73be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 # Coverage directory
 .nyc_output
+coverage
 
 # Dependency directory
 node_modules
diff --git a/.npmignore b/.npmignore
index 0b4d8621..bfcd509c 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,5 +1,6 @@
 .github/
 .nyc_output/
+coverage/
 examples/
 flow-typed/
 tests/
diff --git a/README.md b/README.md
index 456a90ad..87cc690d 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,7 @@ Dotenv is a zero-dependency module that loads environment variables from a `.env
 
 [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/feross/standard)
 [![LICENSE](https://img.shields.io/github/license/motdotla/dotenv.svg)](LICENSE)
+[![codecov](https://codecov.io/gh/motdotla/dotenv-expand/graph/badge.svg?token=pawWEyaMfg)](https://codecov.io/gh/motdotla/dotenv-expand)
 
 * [🌱 Install](#-install)
 * [🏗️ Usage (.env)](#%EF%B8%8F-usage)
diff --git a/package.json b/package.json
index 16397909..64c24404 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "lint-readme": "standard-markdown",
     "pretest": "npm run lint && npm run dts-check",
     "test": "tap tests/*.js --100 -Rspec",
+    "test:coverage": "tap --coverage-report=lcov",
     "prerelease": "npm test",
     "release": "standard-version"
   },