diff --git a/.github/workflows/sonar.yml b/.github/workflows/sonar.yml
deleted file mode 100644
index 31f7a15..0000000
--- a/.github/workflows/sonar.yml
+++ /dev/null
@@ -1,57 +0,0 @@
-name: SonarQube MaisTodos Analysis
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-
-jobs:
-  sonar:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Cache SonarQube packages
-        uses: actions/cache@v3
-        with:
-          path: ~/.sonar/cache
-          key: ${{ runner.os }}-sonar
-          restore-keys: ${{ runner.os }}-sonar
-
-      - name: Download SonarScanner
-        run: |
-          curl -sSL -o sonar-scanner.zip https://binaries.sonarsource.com/Distribution/sonar-scanner-cli/sonar-scanner-cli-5.0.1.3006-linux.zip
-          if [ ! -s sonar-scanner.zip ]; then
-            echo "Erro: O arquivo sonar-scanner.zip está vazio ou não foi baixado corretamente."
-            exit 1
-          fi
-          # Verifica se o arquivo é um ZIP válido
-          if ! unzip -t sonar-scanner.zip >/dev/null 2>&1; then
-            echo "Erro: O arquivo sonar-scanner.zip não é um ZIP válido."
-            exit 1
-          fi
-
-      - name: Extract SonarScanner
-        run: |
-          unzip -o sonar-scanner.zip
-          chmod +x sonar-scanner-5.0.1.3006-linux/bin/sonar-scanner
-          export PATH=$PATH:$PWD/sonar-scanner-5.0.1.3006-linux/bin
-
-      - name: Run SonarQube Scan
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
-        run: |
-          sonar-scanner \
-            -Dsonar.projectKey=MaisTodos.python-creditcard \
-            -Dsonar.sources=. \
-            -Dsonar.host.url=$SONAR_HOST_URL \
-            -Dsonar.token=$SONAR_TOKEN \
-            -Dsonar.scm.provider=git
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..1df3be2
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,30 @@
+name: 1 Tests
+
+on:
+  pull_request:
+    types: ["opened", "edited", "reopened", "synchronize", "ready_for_review"]
+
+jobs:
+  tests:
+    if: (! github.event.pull_request.draft) && github.head_ref != 'main' && github.head_ref != 'develop'
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout do código
+        uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Instalar dependências
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements/dev.txt
+          pip install -r requirements/test.txt
+
+      - name: Rodar testes
+        run: |
+          pytest
diff --git a/creditcard/card.py b/creditcard/card.py
index 668ff74..9d38418 100644
--- a/creditcard/card.py
+++ b/creditcard/card.py
@@ -17,7 +17,7 @@
     "codensa": r"^(870055|590712|529448)[0-9]{10}$",
     "master": (
         r"^"
-        r"(5[1-5][0-9]{14}"
+        r"(5[0-9]{15}"
         r"|2221[0-9]{12}"
         r"|222[2-9][0-9]{12}"
         r"|22[3-9][0-9]{13}"
@@ -25,13 +25,13 @@
         r"|27[01][0-9]{13}"
         r"|2720[0-9]{12}"
         # Suporte aos antigos cartões Maestro que agora são MasterCard
-        r"|5[06789][0-9]{14}"
         r"|600[689][0-9]{12}"
         r"|602[468][0-9]{12}"
         r"|603[0-9]{13}"
         r"|604[69][0-9]{12}"
         r"|605[045][0-9]{12}"
         r"|606[234][0-9]{12}"
+        r"|6087[0-9]{12}"
         r"|6095[0-9]{12}"
         r"|6220[0-9]{12}"
         r"|627[389][0-9]{12}"
diff --git a/tests/unit/test_card.py b/tests/unit/test_card.py
index a5d2347..b414971 100644
--- a/tests/unit/test_card.py
+++ b/tests/unit/test_card.py
@@ -45,6 +45,9 @@ def test_is_valid(self):
             ("master", "6039137880232543"),  # antigo maestro
             ("master", "6063216106123345"),  # antigo maestro
             ("master", "6392403325708112"),  # antigo maestro
+            ("master", "6087101111111111"),
+            ("master", "6087831111111111"),
+            ("master", "5502091111111111"),
             ("codensa", "8700551111111111"),
             ("codensa", "5907121111111111"),
             ("codensa", "5294481111111111"),