diff --git a/homeassistant/components/unifi/controller.py b/homeassistant/components/unifi/controller.py
index a4435ccfecf..30b82c65c85 100644
--- a/homeassistant/components/unifi/controller.py
+++ b/homeassistant/components/unifi/controller.py
@@ -397,7 +397,12 @@ class UniFiController:
                 await self.api.login()
                 self.api.start_websocket()
 
-        except (asyncio.TimeoutError, aiounifi.AiounifiException):
+        except (
+            asyncio.TimeoutError,
+            aiounifi.BadGateway,
+            aiounifi.ServiceUnavailable,
+            aiounifi.AiounifiException,
+        ):
             self.hass.loop.call_later(RETRY_TIMER, self.reconnect)
 
     @callback
@@ -464,7 +469,12 @@ async def get_controller(
         LOGGER.warning("Connected to UniFi at %s but not registered.", host)
         raise AuthenticationRequired from err
 
-    except (asyncio.TimeoutError, aiounifi.RequestError) as err:
+    except (
+        asyncio.TimeoutError,
+        aiounifi.BadGateway,
+        aiounifi.ServiceUnavailable,
+        aiounifi.RequestError,
+    ) as err:
         LOGGER.error("Error connecting to the UniFi controller at %s", host)
         raise CannotConnect from err
 
diff --git a/homeassistant/components/unifi/manifest.json b/homeassistant/components/unifi/manifest.json
index 48c080f82f7..94b1c90f4f3 100644
--- a/homeassistant/components/unifi/manifest.json
+++ b/homeassistant/components/unifi/manifest.json
@@ -3,7 +3,7 @@
   "name": "Ubiquiti UniFi",
   "config_flow": true,
   "documentation": "https://www.home-assistant.io/integrations/unifi",
-  "requirements": ["aiounifi==25"],
+  "requirements": ["aiounifi==26"],
   "codeowners": ["@Kane610"],
   "quality_scale": "platinum"
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index 65bd29256ab..79f1472043d 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -224,7 +224,7 @@ aioshelly==0.5.1
 aioswitcher==1.2.1
 
 # homeassistant.components.unifi
-aiounifi==25
+aiounifi==26
 
 # homeassistant.components.yandex_transport
 aioymaps==1.1.0
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 8497227b164..9604d0579af 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -140,7 +140,7 @@ aioshelly==0.5.1
 aioswitcher==1.2.1
 
 # homeassistant.components.unifi
-aiounifi==25
+aiounifi==26
 
 # homeassistant.components.yandex_transport
 aioymaps==1.1.0
diff --git a/tests/components/unifi/test_controller.py b/tests/components/unifi/test_controller.py
index 83732601cd6..8d5cb85bf9f 100644
--- a/tests/components/unifi/test_controller.py
+++ b/tests/components/unifi/test_controller.py
@@ -295,6 +295,22 @@ async def test_get_controller_login_failed(hass):
         await get_controller(hass, **CONTROLLER_DATA)
 
 
+async def test_get_controller_controller_bad_gateway(hass):
+    """Check that get_controller can handle controller being unavailable."""
+    with patch("aiounifi.Controller.check_unifi_os", return_value=True), patch(
+        "aiounifi.Controller.login", side_effect=aiounifi.BadGateway
+    ), pytest.raises(CannotConnect):
+        await get_controller(hass, **CONTROLLER_DATA)
+
+
+async def test_get_controller_controller_service_unavailable(hass):
+    """Check that get_controller can handle controller being unavailable."""
+    with patch("aiounifi.Controller.check_unifi_os", return_value=True), patch(
+        "aiounifi.Controller.login", side_effect=aiounifi.ServiceUnavailable
+    ), pytest.raises(CannotConnect):
+        await get_controller(hass, **CONTROLLER_DATA)
+
+
 async def test_get_controller_controller_unavailable(hass):
     """Check that get_controller can handle controller being unavailable."""
     with patch("aiounifi.Controller.check_unifi_os", return_value=True), patch(