diff --git a/src/ffx/cli.py b/src/ffx/cli.py
index 146db52..387060f 100755
--- a/src/ffx/cli.py
+++ b/src/ffx/cli.py
@@ -436,10 +436,14 @@ def upgrade(ctx, branch):
         commandSequences.append(['git', 'reset', '--hard', 'HEAD'])
 
     if branch:
-        commandSequences.append(['git', 'checkout', branch])
+        commandSequences += [
+            ['git', 'fetch', 'origin', branch],
+            ['git', 'checkout', '-B', branch, 'FETCH_HEAD'],
+        ]
+    else:
+        commandSequences.append(['git', 'pull'])
 
     commandSequences += [
-        ['git', 'pull'],
         [bundlePipPath, 'install', '--upgrade', 'pip', 'setuptools', 'wheel'],
         [bundlePipPath, 'install', '--editable', '.'],
     ]
diff --git a/tests/assets/dball_S01E89_3_und.sup b/tests/assets/dball_S01E89_3_und.sup
new file mode 100644
index 0000000..5f5c1f8
Binary files /dev/null and b/tests/assets/dball_S01E89_3_und.sup differ
diff --git a/tests/assets/dball_S01E89_4_und.sup b/tests/assets/dball_S01E89_4_und.sup
new file mode 100644
index 0000000..9427590
Binary files /dev/null and b/tests/assets/dball_S01E89_4_und.sup differ
diff --git a/tests/unit/test_cli_upgrade.py b/tests/unit/test_cli_upgrade.py
index d392f27..f68cc2f 100644
--- a/tests/unit/test_cli_upgrade.py
+++ b/tests/unit/test_cli_upgrade.py
@@ -57,7 +57,7 @@ class UpgradeCommandTests(unittest.TestCase):
         self.assertTrue(subprocess_calls[0][1]["capture_output"])
         self.assertTrue(subprocess_calls[0][1]["text"])
 
-    def test_upgrade_resets_before_checkout_and_pull_when_user_confirms(self):
+    def test_upgrade_resets_then_fetches_and_checks_out_requested_branch_when_user_confirms(self):
         runner = CliRunner()
         repo_path = "/tmp/ffx-repo"
         pip_path = "/tmp/ffx-venv/bin/pip"
@@ -85,8 +85,8 @@ class UpgradeCommandTests(unittest.TestCase):
             [
                 ['git', 'status', '--porcelain', '--untracked-files=no'],
                 ['git', 'reset', '--hard', 'HEAD'],
-                ['git', 'checkout', 'main'],
-                ['git', 'pull'],
+                ['git', 'fetch', 'origin', 'main'],
+                ['git', 'checkout', '-B', 'main', 'FETCH_HEAD'],
                 [pip_path, 'install', '--upgrade', 'pip', 'setuptools', 'wheel'],
                 [pip_path, 'install', '--editable', '.'],
             ],
@@ -95,6 +95,39 @@ class UpgradeCommandTests(unittest.TestCase):
         for args, kwargs in subprocess_calls[1:]:
             self.assertEqual(repo_path, kwargs["cwd"], args)
 
+    def test_upgrade_pulls_current_branch_when_no_branch_is_requested(self):
+        runner = CliRunner()
+        repo_path = "/tmp/ffx-repo"
+        pip_path = "/tmp/ffx-venv/bin/pip"
+
+        subprocess_calls = []
+
+        def fake_run(args, **kwargs):
+            subprocess_calls.append((args, kwargs))
+            if args == ['git', 'status', '--porcelain', '--untracked-files=no']:
+                return self.make_completed(args, stdout="")
+            return self.make_completed(args)
+
+        with (
+            patch.object(cli, "getBundleRepoPath", return_value=repo_path),
+            patch.object(cli, "getBundlePipPath", return_value=pip_path),
+            patch.object(cli.os.path, "isdir", return_value=True),
+            patch.object(cli.os.path, "isfile", return_value=True),
+            patch.object(cli.subprocess, "run", side_effect=fake_run),
+        ):
+            result = runner.invoke(cli.ffx, ["upgrade"])
+
+        self.assertEqual(0, result.exit_code, result.output)
+        self.assertEqual(
+            [
+                ['git', 'status', '--porcelain', '--untracked-files=no'],
+                ['git', 'pull'],
+                [pip_path, 'install', '--upgrade', 'pip', 'setuptools', 'wheel'],
+                [pip_path, 'install', '--editable', '.'],
+            ],
+            [call[0] for call in subprocess_calls],
+        )
+
 
 if __name__ == "__main__":
     unittest.main()