diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 75e7570..214e057 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -47,13 +47,7 @@ jobs:
       - name: tox
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: tox -e py,lint,release
-
-      - uses: codecov/codecov-action@v2
-        with:
-          name: ${{ matrix.os }}_${{ matrix.python-version}}
-          fail_ci_if_error: true
-          verbose: true
+        run: tox -e py,lint,release # coveralls
 
       - name: upload dist
         uses: actions/upload-artifact@v3
diff --git a/README.rst b/README.rst
index 4da1b86..6422e85 100644
--- a/README.rst
+++ b/README.rst
@@ -6,6 +6,9 @@
       |_|_|_\___/\__,_\___|_| |_||_|_/__\___|
 
 
+.. image:: https://img.shields.io/coveralls/github/PyCQA/modernize?label=coveralls&logo=coveralls
+    :alt: Coveralls
+    :target: https://coveralls.io/github/PyCQA/modernize
 .. image:: https://img.shields.io/readthedocs/modernize?logo=read-the-docs
     :alt: Read the Docs
     :target: https://modernize.readthedocs.io/en/latest/
diff --git a/pyproject.toml b/pyproject.toml
index 5bb0f1c..e39f2bf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -98,6 +98,13 @@ wheel_build_env = build
 # empty environment to build universal wheel once per tox invocation
 # https://github.com/ionelmc/tox-wheel#build-configuration
 
+[testenv:coveralls]
+passenv = GITHUB_*
+deps =
+  coveralls
+  coverage>=5.3
+commands = coveralls
+
 [testenv:lint]
 deps = pre-commit
 commands = pre-commit run --all-files --show-diff-on-failure {posargs}