diff --git a/custom_components/hilo/sensor.py b/custom_components/hilo/sensor.py
index f8e378a3..410632db 100755
--- a/custom_components/hilo/sensor.py
+++ b/custom_components/hilo/sensor.py
@@ -40,8 +40,8 @@
 from pyhilo.device import HiloDevice
 from pyhilo.event import Event
 from pyhilo.util import from_utc_timestamp
-import ruyaml as yaml
-from ruyaml.scanner import ScannerError
+import yaml
+from yaml.scanner import ScannerError
 
 from . import Hilo
 from .const import (
@@ -761,7 +761,11 @@ async def _load_history(self) -> list:
     async def _save_history(self, history: list):
         async with aiofiles.open(self._history_state_yaml, mode="w") as yaml_file:
             LOG.debug("Saving history state to yaml file")
-            await yaml_file.write(yaml.dump(history, Dumper=yaml.RoundTripDumper))
+            # TODO: Use asyncio.get_running_loop() and run_in_executor to write
+            # to the file in a non blocking manner. Currently, the file writes
+            # are properly async but the yaml dump is done synchroniously on the
+            # main event loop
+            await yaml_file.write(yaml.dump(history))
 
 
 class HiloChallengeSensor(HiloEntity, SensorEntity):
diff --git a/requirements.txt b/requirements.txt
index dd14d3a8..503130ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ colorlog==6.9.0
 homeassistant~=2025.3.4
 pip>=21.3.1
 ruff==0.11.3
+pyyaml>=6.0.2