diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4b67c5e..93132b5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,19 +7,17 @@ jobs:
       id-token: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
-      - name: Set up Python 3.10
-        uses: actions/setup-python@v4
+        uses: actions/checkout@v5
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v6
         with:
-          python-version: '3.10'
+          python-version: '3.11'
       - name: Install dependencies
         run: pip install -r requirements.txt
       - name: Run tests and collect coverage
         run: pytest --cov app --junitxml=junit.xml -o junit_family=legacy
       - name: Upload test results to Codecov
         if: ${{ !cancelled() }}
-        run: |
-          pip install sentry-prevent-cli
-          sentry-prevent-cli -v upload --report-type test-results
+        uses: getsentry/prevent-action@v0
         env:
           PREVENT_TOKEN: ${{ secrets.PREVENT_TOKEN }}
diff --git a/app/test_calculator.py b/app/test_calculator.py
index f564193..6536cbf 100644
--- a/app/test_calculator.py
+++ b/app/test_calculator.py
@@ -1,6 +1,24 @@
+import random
+import time
+
 from .calculator import Calculator
 
 
+def test_flaky():
+    assert random.random() <= 0.8
+
+def test_fail_1():
+    assert True is False
+
+def test_fail_2():
+    assert True is False
+
+def test_fail_3():
+    assert True is False
+
+def test_slow():
+    time.sleep(5)
+
 def test_add():
     assert Calculator.add(1, 2) == 3.0
     assert Calculator.add(1.0, 2.0) == 3.0