diff --git a/homeassistant/components/deconz/gateway.py b/homeassistant/components/deconz/gateway.py
index ef07a97ad8f..f54cd4076d3 100644
--- a/homeassistant/components/deconz/gateway.py
+++ b/homeassistant/components/deconz/gateway.py
@@ -289,6 +289,6 @@ async def get_deconz_session(
         LOGGER.warning("Invalid key for deCONZ at %s", config[CONF_HOST])
         raise AuthenticationRequired from err
 
-    except (asyncio.TimeoutError, errors.RequestError) as err:
+    except (asyncio.TimeoutError, errors.RequestError, errors.ResponseError) as err:
         LOGGER.error("Error connecting to deCONZ gateway at %s", config[CONF_HOST])
         raise CannotConnect from err
diff --git a/tests/components/deconz/test_gateway.py b/tests/components/deconz/test_gateway.py
index 3a4f6b907af..e6ded3981c4 100644
--- a/tests/components/deconz/test_gateway.py
+++ b/tests/components/deconz/test_gateway.py
@@ -286,6 +286,7 @@ async def test_get_deconz_session(hass):
     [
         (asyncio.TimeoutError, CannotConnect),
         (pydeconz.RequestError, CannotConnect),
+        (pydeconz.ResponseError, CannotConnect),
         (pydeconz.Unauthorized, AuthenticationRequired),
     ],
 )