diff --git a/tests/guest-tools/win/test_guest_tools_win.py b/tests/guest-tools/win/test_guest_tools_win.py
index 1b1eb7d2..bf5d11b4 100644
--- a/tests/guest-tools/win/test_guest_tools_win.py
+++ b/tests/guest-tools/win/test_guest_tools_win.py
@@ -35,10 +35,11 @@ def install_guest_tools(vm: VM, action: PowerAction, check: bool = True):
     else:
         if check:
             raise Exception(f"Cannot check exit code with {action} action")
+        msiexec_cmd = " ".join(msiexec_args)
         install_cmd = [
             # when powershell runs msiexec it doesn't wait for it to end unlike ssh
             # it only waits for stdin closing so we need Start-Process -Wait here
-            f"Start-Process -Wait msiexec.exe -ArgumentList '{" ".join(msiexec_args)}'"
+            f"Start-Process -Wait msiexec.exe -ArgumentList '{msiexec_cmd}'"
         ]
         if action != PowerAction.Nothing:
             install_cmd += ["Stop-Computer -Force"]
@@ -248,6 +249,42 @@ def vm_install_xcpng_v8_tools(self, vm_instance: VM):
         )
         return vm_instance
 
+    @pytest.fixture
+    def vm_install_xcpng_v9_tools(self, vm_instance: VM):
+        vm = vm_instance
+
+        vm.insert_cd("other-guest-tools-win.iso")
+        time.sleep(5)
+
+        logging.info("Install VM root certs")
+        vm.ssh(
+            [
+                "certutil",
+                "-addstore",
+                "-f",
+                "Root",
+                "D:/xcp-ng-9.0.9000/testsign/XCP-ng_Test_Signer.crt",
+            ]
+        )
+        vm.ssh(
+            [
+                "certutil",
+                "-addstore",
+                "-f",
+                "TrustedPublisher",
+                "D:/xcp-ng-9.0.9000/testsign/XCP-ng_Test_Signer.crt",
+            ]
+        )
+
+        vm.eject_cd()
+
+        install_other_drivers(
+            vm,
+            "xcp-ng-9.0.9000\\package\\XenDrivers-x64.msi",
+            is_msi=True,
+        )
+        return vm
+
     @pytest.fixture
     def vm_install_wu_drivers(self, vm_prepared: VM):
         (vm, snapshot) = vm_prepared
@@ -297,6 +334,11 @@ def test_install_with_xcpng_v8_tools(self, vm_install_xcpng_v8_tools: VM):
         )
         assert exitcode == ERROR_INSTALL_FAILURE
 
+    def test_upgrade_with_xcpng_v9_tools(self, vm_install_xcpng_v9_tools: VM):
+        vm = vm_install_xcpng_v9_tools
+        install_cert_and_tools(vm, PowerAction.Reboot, check=False)
+        assert is_drivers_installed(vm)
+
     def test_install_with_citrix_wu(self, vm_install_wu_drivers: VM):
         exitcode = install_cert_and_tools(
             vm_install_wu_drivers, PowerAction.Nothing, check=False