diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index fa21274..aeb4b38 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -3,12 +3,12 @@ name: tests
 on:
   push:
     branches:
-      - '**'
+      - "**"
     tags:
-      - '!**'
+      - "!**"
   pull_request:
     branches:
-      - '**'
+      - "**"
 
 jobs:
   tests:
@@ -19,9 +19,9 @@ jobs:
 
     name: Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@82c7e631bb3cdc910f68e0081d67478d79c6982d # v5.1.0
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install and set up Poetry
@@ -31,7 +31,6 @@ jobs:
       - name: Install dependencies
         run: |
           poetry install -vvv
-          poetry add -D coveralls
       - name: Lint with flake8
         run: |
           poetry run flake8
@@ -41,4 +40,9 @@ jobs:
         run: |
           poetry run coverage run tests/run_tests.py
           poetry run coverage report -m
-          poetry run coveralls --service=github
+      - name: Coveralls
+        uses: coverallsapp/github-action@643bc377ffa44ace6394b2b5d0d3950076de9f63 # v2.3.0
+        with:
+          coverage-reporter-version: "v0.6.9"
+          flag-name: run ${{ join(matrix.*, ' - ') }}
+          parallel: true