diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml
index 2cd07c5..72d9dc4 100644
--- a/.github/workflows/pull_request.yaml
+++ b/.github/workflows/pull_request.yaml
@@ -6,20 +6,29 @@ on:
 jobs:
   lint:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.11, 3.12, 3.13]
+
     steps:
+
     - name: Check out code
       uses: actions/checkout@v2
 
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.7
+        python-version: ${{ matrix.python-version }}
 
     - name: Install pipenv
       run: |
         python -m pip install --upgrade pip
         pip install pipenv
 
+    - name: Update Python version in Pipfile
+      run: |
+        sed -i "s/python-version = \".*\"/python-version = \"${{ matrix.python-version }}\"/" Pipfile
+
     - name: Install dependencies using pipenv
       run: pipenv install --dev
 
@@ -28,22 +37,31 @@ jobs:
 
   pytest:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.11, 3.12, 3.13]
+
     steps:
+
     - name: Check out code
       uses: actions/checkout@v2
 
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.7
+        python-version: ${{ matrix.python-version }}
 
     - name: Install pipenv
       run: |
         python -m pip install --upgrade pip
         pip install pipenv
 
+    - name: Update Python version in Pipfile
+      run: |
+        sed -i "s/python-version = \".*\"/python-version = \"${{ matrix.python-version }}\"/" Pipfile
+
     - name: Install dependencies using pipenv
       run: pipenv install --dev
 
-    - name: Run Flake8 using pipenv
+    - name: Run pytest using pipenv
       run: pipenv run pytest
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index e307819..8a0e27d 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -16,7 +16,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.7
+        python-version: 3.13
 
     - name: Install necessary packages for make
       run: sudo apt-get update && sudo apt-get install -y build-essential
diff --git a/.python-version b/.python-version
new file mode 100644
index 0000000..4eba2a6
--- /dev/null
+++ b/.python-version
@@ -0,0 +1 @@
+3.13.0
diff --git a/Pipfile b/Pipfile
index 151a4f9..f05af58 100644
--- a/Pipfile
+++ b/Pipfile
@@ -19,4 +19,4 @@ pytest = "7.4.4"
 pytest-mock = "3.11.1"
 
 [requires]
-python_version = "3.7"
+python_version = "3.13.0"
diff --git a/gptpr/test_gh.py b/gptpr/test_gh.py
new file mode 100644
index 0000000..64e386a
--- /dev/null
+++ b/gptpr/test_gh.py
@@ -0,0 +1,56 @@
+from types import SimpleNamespace
+import gptpr.gh as gh_module
+
+
+def test_create_pr_success(mocker, capsys):
+    fake_repo = mocker.Mock()
+    pr = SimpleNamespace(html_url="http://fake.url")
+    fake_repo.create_pull.return_value = pr
+
+    fake_gh = SimpleNamespace()
+    fake_gh.get_repo = lambda repo_name: fake_repo
+    mocker.patch.object(gh_module, 'gh', fake_gh)
+
+    branch_info = SimpleNamespace(owner="owner", repo="repo",
+                                  branch="feature-branch", base_branch="main")
+    pr_data = SimpleNamespace(title="Test PR", branch_info=branch_info,
+                              create_body=lambda: "My body")
+
+    gh_module.create_pr(pr_data, yield_confirmation=True)
+
+    fake_repo.create_pull.assert_called_once_with(
+        title="Test PR", body="My body",
+        head="feature-branch", base="main"
+    )
+    captured = capsys.readouterr()
+    assert "Pull request created successfully" in captured.out
+    assert "http://fake.url" in captured.out
+
+
+def test_create_pr_cancel(mocker, capsys):
+    fake_repo = mocker.Mock()
+    fake_gh = SimpleNamespace()
+    fake_gh.get_repo = lambda repo_name: fake_repo
+    mocker.patch.object(gh_module, 'gh', fake_gh)
+
+    class FakePrompt:
+        def __init__(self, *args, **kwargs):
+            pass
+
+        def execute(self):
+            return False
+
+    mocker.patch.object(gh_module.inquirer, 'confirm',
+                        lambda *args, **kwargs: FakePrompt(*args, **kwargs))
+
+    branch_info = SimpleNamespace(owner="owner", repo="repo",
+                                  branch="branch", base_branch="base")
+    pr_data = SimpleNamespace(title="Cancel PR", branch_info=branch_info,
+                              create_body=lambda: "Body")
+
+    gh_module.create_pr(pr_data, yield_confirmation=False)
+
+    fake_repo.create_pull.assert_not_called()
+    captured = capsys.readouterr()
+
+    assert "cancelling..." in captured.out