diff --git a/homeassistant/components/knx/__init__.py b/homeassistant/components/knx/__init__.py
index 501ff856333..87ade4955a0 100644
--- a/homeassistant/components/knx/__init__.py
+++ b/homeassistant/components/knx/__init__.py
@@ -191,20 +191,17 @@ class KNXModule:
         """Initialize of KNX object."""
         self.xknx = XKNX(
             config=self.config_file(),
-            loop=self.hass.loop,
             own_address=self.config[DOMAIN][CONF_KNX_INDIVIDUAL_ADDRESS],
             rate_limit=self.config[DOMAIN][CONF_KNX_RATE_LIMIT],
             multicast_group=self.config[DOMAIN][CONF_KNX_MCAST_GRP],
             multicast_port=self.config[DOMAIN][CONF_KNX_MCAST_PORT],
+            connection_config=self.connection_config(),
+            state_updater=self.config[DOMAIN][CONF_KNX_STATE_UPDATER],
         )
 
     async def start(self):
         """Start KNX object. Connect to tunneling or Routing device."""
-        connection_config = self.connection_config()
-        await self.xknx.start(
-            state_updater=self.config[DOMAIN][CONF_KNX_STATE_UPDATER],
-            connection_config=connection_config,
-        )
+        await self.xknx.start()
         self.hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, self.stop)
         self.connected = True
 
@@ -227,9 +224,8 @@ class KNXModule:
             return self.connection_config_tunneling()
         if CONF_KNX_ROUTING in self.config[DOMAIN]:
             return self.connection_config_routing()
-        # return None to let xknx use config from xknx.yaml connection block if given
-        #   otherwise it will use default ConnectionConfig (Automatic)
-        return None
+        # config from xknx.yaml always has priority later on
+        return ConnectionConfig()
 
     def connection_config_routing(self):
         """Return the connection_config if routing is configured."""
diff --git a/homeassistant/components/knx/manifest.json b/homeassistant/components/knx/manifest.json
index f231d11fa9f..2d387f0653d 100644
--- a/homeassistant/components/knx/manifest.json
+++ b/homeassistant/components/knx/manifest.json
@@ -2,7 +2,7 @@
   "domain": "knx",
   "name": "KNX",
   "documentation": "https://www.home-assistant.io/integrations/knx",
-  "requirements": ["xknx==0.14.4"],
+  "requirements": ["xknx==0.15.0"],
   "codeowners": ["@Julius2342", "@farmio", "@marvin-w"],
   "quality_scale": "silver"
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index 35fcda2ef6e..1b707eb5c93 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -2277,7 +2277,7 @@ xboxapi==2.0.1
 xfinity-gateway==0.0.4
 
 # homeassistant.components.knx
-xknx==0.14.4
+xknx==0.15.0
 
 # homeassistant.components.bluesound
 # homeassistant.components.rest