diff --git a/homeassistant/components/system_bridge/manifest.json b/homeassistant/components/system_bridge/manifest.json
index 6146a32fd8e..7462966ae39 100644
--- a/homeassistant/components/system_bridge/manifest.json
+++ b/homeassistant/components/system_bridge/manifest.json
@@ -10,6 +10,6 @@
   "iot_class": "local_push",
   "loggers": ["systembridgeconnector"],
   "quality_scale": "silver",
-  "requirements": ["systembridgeconnector==3.4.4"],
+  "requirements": ["systembridgeconnector==3.4.8"],
   "zeroconf": ["_system-bridge._tcp.local."]
 }
diff --git a/homeassistant/components/system_bridge/sensor.py b/homeassistant/components/system_bridge/sensor.py
index bc02c9f1cda..eb835b2c953 100644
--- a/homeassistant/components/system_bridge/sensor.py
+++ b/homeassistant/components/system_bridge/sensor.py
@@ -51,8 +51,8 @@ class SystemBridgeSensorEntityDescription(SensorEntityDescription):
 
 def battery_time_remaining(data: SystemBridgeCoordinatorData) -> datetime | None:
     """Return the battery time remaining."""
-    if data.battery.sensors_secsleft is not None:
-        return utcnow() + timedelta(seconds=data.battery.sensors_secsleft)
+    if (value := getattr(data.battery, "sensors_secsleft", None)) is not None:
+        return utcnow() + timedelta(seconds=value)
     return None
 
 
@@ -65,29 +65,29 @@ def cpu_speed(data: SystemBridgeCoordinatorData) -> float | None:
 
 def gpu_core_clock_speed(data: SystemBridgeCoordinatorData, key: str) -> float | None:
     """Return the GPU core clock speed."""
-    if getattr(data.gpu, f"{key}_core_clock") is not None:
-        return round(getattr(data.gpu, f"{key}_core_clock"))
+    if (value := getattr(data.gpu, f"{key}_core_clock", None)) is not None:
+        return round(value)
     return None
 
 
 def gpu_memory_clock_speed(data: SystemBridgeCoordinatorData, key: str) -> float | None:
     """Return the GPU memory clock speed."""
-    if getattr(data.gpu, f"{key}_memory_clock") is not None:
-        return round(getattr(data.gpu, f"{key}_memory_clock"))
+    if (value := getattr(data.gpu, f"{key}_memory_clock", None)) is not None:
+        return round(value)
     return None
 
 
 def gpu_memory_free(data: SystemBridgeCoordinatorData, key: str) -> float | None:
     """Return the free GPU memory."""
-    if getattr(data.gpu, f"{key}_memory_free") is not None:
-        return round(getattr(data.gpu, f"{key}_memory_free") / 10**3, 2)
+    if (value := getattr(data.gpu, f"{key}_memory_free", None)) is not None:
+        return round(value)
     return None
 
 
 def gpu_memory_used(data: SystemBridgeCoordinatorData, key: str) -> float | None:
     """Return the used GPU memory."""
-    if getattr(data.gpu, f"{key}_memory_used") is not None:
-        return round(getattr(data.gpu, f"{key}_memory_used") / 10**3, 2)
+    if (value := getattr(data.gpu, f"{key}_memory_used", None)) is not None:
+        return round(value)
     return None
 
 
@@ -95,14 +95,11 @@ def gpu_memory_used_percentage(
     data: SystemBridgeCoordinatorData, key: str
 ) -> float | None:
     """Return the used GPU memory percentage."""
-    if (
-        getattr(data.gpu, f"{key}_memory_used") is not None
-        and getattr(data.gpu, f"{key}_memory_total") is not None
+    if ((used := getattr(data.gpu, f"{key}_memory_used", None)) is not None) and (
+        (total := getattr(data.gpu, f"{key}_memory_total", None)) is not None
     ):
         return round(
-            getattr(data.gpu, f"{key}_memory_used")
-            / getattr(data.gpu, f"{key}_memory_total")
-            * 100,
+            used / total * 100,
             2,
         )
     return None
@@ -266,7 +263,7 @@ async def async_setup_entry(
                     native_unit_of_measurement=PERCENTAGE,
                     icon="mdi:harddisk",
                     value=lambda data, p=partition: getattr(
-                        data.disk, f"usage_{p}_percent"
+                        data.disk, f"usage_{p}_percent", None
                     ),
                 ),
                 entry.data[CONF_PORT],
@@ -283,15 +280,17 @@ async def async_setup_entry(
                 SystemBridgeSensor(coordinator, description, entry.data[CONF_PORT])
             )
 
-    displays = []
-    for display in coordinator.data.display.displays:
-        displays.append(
+    displays: list[dict[str, str]] = []
+    if coordinator.data.display.displays is not None:
+        displays.extend(
             {
                 "key": display,
                 "name": getattr(coordinator.data.display, f"{display}_name").replace(
                     "Display ", ""
                 ),
-            },
+            }
+            for display in coordinator.data.display.displays
+            if hasattr(coordinator.data.display, f"{display}_name")
         )
     display_count = len(displays)
 
@@ -321,7 +320,7 @@ async def async_setup_entry(
                     native_unit_of_measurement=PIXELS,
                     icon="mdi:monitor",
                     value=lambda data, k=display["key"]: getattr(
-                        data.display, f"{k}_resolution_horizontal"
+                        data.display, f"{k}_resolution_horizontal", None
                     ),
                 ),
                 entry.data[CONF_PORT],
@@ -335,7 +334,7 @@ async def async_setup_entry(
                     native_unit_of_measurement=PIXELS,
                     icon="mdi:monitor",
                     value=lambda data, k=display["key"]: getattr(
-                        data.display, f"{k}_resolution_vertical"
+                        data.display, f"{k}_resolution_vertical", None
                     ),
                 ),
                 entry.data[CONF_PORT],
@@ -350,20 +349,22 @@ async def async_setup_entry(
                     device_class=SensorDeviceClass.FREQUENCY,
                     icon="mdi:monitor",
                     value=lambda data, k=display["key"]: getattr(
-                        data.display, f"{k}_refresh_rate"
+                        data.display, f"{k}_refresh_rate", None
                     ),
                 ),
                 entry.data[CONF_PORT],
             ),
         ]
 
-    gpus = []
-    for gpu in coordinator.data.gpu.gpus:
-        gpus.append(
+    gpus: list[dict[str, str]] = []
+    if coordinator.data.gpu.gpus is not None:
+        gpus.extend(
             {
                 "key": gpu,
                 "name": getattr(coordinator.data.gpu, f"{gpu}_name"),
-            },
+            }
+            for gpu in coordinator.data.gpu.gpus
+            if hasattr(coordinator.data.gpu, f"{gpu}_name")
         )
 
     for index, gpu in enumerate(gpus):
@@ -448,7 +449,7 @@ async def async_setup_entry(
                     native_unit_of_measurement=REVOLUTIONS_PER_MINUTE,
                     icon="mdi:fan",
                     value=lambda data, k=gpu["key"]: getattr(
-                        data.gpu, f"{k}_fan_speed"
+                        data.gpu, f"{k}_fan_speed", None
                     ),
                 ),
                 entry.data[CONF_PORT],
@@ -462,7 +463,9 @@ async def async_setup_entry(
                     device_class=SensorDeviceClass.POWER,
                     state_class=SensorStateClass.MEASUREMENT,
                     native_unit_of_measurement=UnitOfPower.WATT,
-                    value=lambda data, k=gpu["key"]: getattr(data.gpu, f"{k}_power"),
+                    value=lambda data, k=gpu["key"]: getattr(
+                        data.gpu, f"{k}_power", None
+                    ),
                 ),
                 entry.data[CONF_PORT],
             ),
@@ -476,7 +479,7 @@ async def async_setup_entry(
                     state_class=SensorStateClass.MEASUREMENT,
                     native_unit_of_measurement=UnitOfTemperature.CELSIUS,
                     value=lambda data, k=gpu["key"]: getattr(
-                        data.gpu, f"{k}_temperature"
+                        data.gpu, f"{k}_temperature", None
                     ),
                 ),
                 entry.data[CONF_PORT],
@@ -490,7 +493,7 @@ async def async_setup_entry(
                     native_unit_of_measurement=PERCENTAGE,
                     icon="mdi:percent",
                     value=lambda data, k=gpu["key"]: getattr(
-                        data.gpu, f"{k}_core_load"
+                        data.gpu, f"{k}_core_load", None
                     ),
                 ),
                 entry.data[CONF_PORT],
@@ -509,7 +512,7 @@ async def async_setup_entry(
                     state_class=SensorStateClass.MEASUREMENT,
                     native_unit_of_measurement=PERCENTAGE,
                     icon="mdi:percent",
-                    value=lambda data, k=index: getattr(data.cpu, f"usage_{k}"),
+                    value=lambda data, k=index: getattr(data.cpu, f"usage_{k}", None),
                 ),
                 entry.data[CONF_PORT],
             ),
diff --git a/requirements_all.txt b/requirements_all.txt
index 5a9e407710b..0ca58159d05 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -2449,7 +2449,7 @@ swisshydrodata==0.1.0
 synology-srm==0.2.0
 
 # homeassistant.components.system_bridge
-systembridgeconnector==3.4.4
+systembridgeconnector==3.4.8
 
 # homeassistant.components.tailscale
 tailscale==0.2.0
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 1821c6b2394..7d86bf8a0a2 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -1743,7 +1743,7 @@ sunwatcher==0.2.1
 surepy==0.8.0
 
 # homeassistant.components.system_bridge
-systembridgeconnector==3.4.4
+systembridgeconnector==3.4.8
 
 # homeassistant.components.tailscale
 tailscale==0.2.0