diff --git a/requirements_tests.txt b/requirements_tests.txt
index 948ffe898..32536f2f9 100644
--- a/requirements_tests.txt
+++ b/requirements_tests.txt
@@ -5,7 +5,7 @@ flake8-docstrings==1.6.0
 flake8==3.9.2
 pre-commit==2.15.0
 pydocstyle==6.1.1
-pylint==2.10.2
+pylint==2.11.1
 pytest-aiohttp==0.3.0
 pytest-asyncio==0.12.0 # NB!: Versions over 0.12.0 breaks pytest-aiohttp (https://github.com/aio-libs/pytest-aiohttp/issues/16)
 pytest-cov==2.12.1
diff --git a/supervisor/addons/addon.py b/supervisor/addons/addon.py
index d046e8fda..28e577d90 100644
--- a/supervisor/addons/addon.py
+++ b/supervisor/addons/addon.py
@@ -530,8 +530,7 @@ class Addon(AddonModel):
 
         # Write pulse config
         try:
-            with self.path_pulse.open("w") as config_file:
-                config_file.write(pulse_config)
+            self.path_pulse.write_text(pulse_config, encoding="utf-8")
         except OSError as err:
             _LOGGER.error(
                 "Add-on %s can't write pulse/client.config: %s", self.slug, err
diff --git a/supervisor/addons/model.py b/supervisor/addons/model.py
index 945b0261c..8f4c990f8 100644
--- a/supervisor/addons/model.py
+++ b/supervisor/addons/model.py
@@ -184,8 +184,7 @@ class AddonModel(CoreSysAttributes, ABC):
             return None
 
         # Return data
-        with readme.open("r") as readme_file:
-            return readme_file.read()
+        return readme.read_text(encoding="utf-8")
 
     @property
     def repository(self) -> str:
diff --git a/supervisor/bootstrap.py b/supervisor/bootstrap.py
index d55b78df3..bb08b2d82 100644
--- a/supervisor/bootstrap.py
+++ b/supervisor/bootstrap.py
@@ -94,7 +94,7 @@ async def initialize_coresys() -> CoreSys:
 
     # Set Machine/Host ID
     if MACHINE_ID.exists():
-        coresys.machine_id = MACHINE_ID.read_text().strip()
+        coresys.machine_id = MACHINE_ID.read_text(encoding="utf-8").strip()
 
     # Check if ENV is in development mode
     if coresys.dev:
diff --git a/supervisor/core.py b/supervisor/core.py
index 997adc8a2..2c81983a0 100644
--- a/supervisor/core.py
+++ b/supervisor/core.py
@@ -55,7 +55,7 @@ class Core(CoreSysAttributes):
         if self._state == new_state:
             return
         try:
-            RUN_SUPERVISOR_STATE.write_text(new_state.value)
+            RUN_SUPERVISOR_STATE.write_text(new_state.value, encoding="utf-8")
         except OSError as err:
             _LOGGER.warning(
                 "Can't update the Supervisor state to %s: %s", new_state, err
diff --git a/supervisor/dbus/payloads/generate.py b/supervisor/dbus/payloads/generate.py
index b862c3935..500f2d93d 100644
--- a/supervisor/dbus/payloads/generate.py
+++ b/supervisor/dbus/payloads/generate.py
@@ -32,9 +32,7 @@ def interface_update_payload(
 
     def ipv6_to_byte(ip_address: IPv6Address) -> str:
         """Convert an ipv6 to an byte array."""
-        return (
-            f'[byte {", ".join("0x{:02x}".format(val) for val in ip_address.packed)}]'
-        )
+        return f'[byte {", ".join(f"0x{val:02x}" for val in ip_address.packed)}]'
 
     # Init template
     env.filters["ipv4_to_int"] = ipv4_to_int
diff --git a/supervisor/hardware/disk.py b/supervisor/hardware/disk.py
index 5c213b509..3666f74a3 100644
--- a/supervisor/hardware/disk.py
+++ b/supervisor/hardware/disk.py
@@ -65,7 +65,7 @@ class HwDisk(CoreSysAttributes):
         return round(free / (1024.0 ** 3), 1)
 
     def _get_mountinfo(self, path: str) -> str:
-        mountinfo = _MOUNTINFO.read_text()
+        mountinfo = _MOUNTINFO.read_text(encoding="utf-8")
         for line in mountinfo.splitlines():
             mountinfoarr = line.split()
             if mountinfoarr[4] == path:
@@ -92,7 +92,7 @@ class HwDisk(CoreSysAttributes):
             return None
 
         # JEDEC health status DEVICE_LIFE_TIME_EST_TYP_A/B
-        emmc_life_time = life_time_path.read_text().split()
+        emmc_life_time = life_time_path.read_text(encoding="utf-8").split()
 
         if len(emmc_life_time) < 2:
             return None
diff --git a/supervisor/hardware/helper.py b/supervisor/hardware/helper.py
index a10881cdc..f2f70a53d 100644
--- a/supervisor/hardware/helper.py
+++ b/supervisor/hardware/helper.py
@@ -45,8 +45,7 @@ class HwHelper(CoreSysAttributes):
     def last_boot(self) -> Optional[str]:
         """Return last boot time."""
         try:
-            with _PROC_STAT.open("r") as stat_file:
-                stats: str = stat_file.read()
+            stats: str = _PROC_STAT.read_text(encoding="utf-8")
         except OSError as err:
             _LOGGER.error("Can't read stat data: %s", err)
             return None
diff --git a/supervisor/homeassistant/module.py b/supervisor/homeassistant/module.py
index a7ba03f4a..88a37f634 100644
--- a/supervisor/homeassistant/module.py
+++ b/supervisor/homeassistant/module.py
@@ -114,8 +114,8 @@ class HomeAssistant(FileConfiguration, CoreSysAttributes):
     @property
     def api_url(self) -> str:
         """Return API url to Home Assistant."""
-        return "{}://{}:{}".format(
-            "https" if self.api_ssl else "http", self.ip_address, self.api_port
+        return (
+            f"{'https' if self.api_ssl else 'http'}://{self.ip_address}:{self.api_port}"
         )
 
     @property
@@ -257,8 +257,7 @@ class HomeAssistant(FileConfiguration, CoreSysAttributes):
 
         # Write pulse config
         try:
-            with self.path_pulse.open("w") as config_file:
-                config_file.write(pulse_config)
+            self.path_pulse.write_text(pulse_config, encoding="utf-8")
         except OSError as err:
             _LOGGER.error("Home Assistant can't write pulse/client.config: %s", err)
         else:
diff --git a/supervisor/plugins/dns.py b/supervisor/plugins/dns.py
index 64cdf6864..f9a024c45 100644
--- a/supervisor/plugins/dns.py
+++ b/supervisor/plugins/dns.py
@@ -312,7 +312,7 @@ class PluginDns(PluginBase):
         data = self.hosts_template.render(entries=self._hosts)
 
         try:
-            self.hosts.write_text(data)
+            self.hosts.write_text(data, encoding="utf-8")
         except OSError as err:
             _LOGGER.error("Can't update hosts: %s", err)
             raise CoreDNSError() from err
diff --git a/supervisor/resolution/evaluations/apparmor.py b/supervisor/resolution/evaluations/apparmor.py
index 496c59376..a7174accb 100644
--- a/supervisor/resolution/evaluations/apparmor.py
+++ b/supervisor/resolution/evaluations/apparmor.py
@@ -35,6 +35,6 @@ class EvaluateAppArmor(EvaluateBase):
     async def evaluate(self) -> None:
         """Run evaluation."""
         try:
-            return _APPARMOR_KERNEL.read_text().strip().upper() != "Y"
+            return _APPARMOR_KERNEL.read_text(encoding="utf-8").strip().upper() != "Y"
         except OSError:
             return True
diff --git a/supervisor/resolution/evaluations/lxc.py b/supervisor/resolution/evaluations/lxc.py
index f18ac966a..7343dddfb 100644
--- a/supervisor/resolution/evaluations/lxc.py
+++ b/supervisor/resolution/evaluations/lxc.py
@@ -34,6 +34,6 @@ class EvaluateLxc(EvaluateBase):
     async def evaluate(self):
         """Run evaluation."""
         with suppress(OSError):
-            if "container=lxc" in Path("/proc/1/environ").read_text():
+            if "container=lxc" in Path("/proc/1/environ").read_text(encoding="utf-8"):
                 return True
         return Path("/dev/lxd/sock").exists()
diff --git a/supervisor/supervisor.py b/supervisor/supervisor.py
index 7944e1ac9..4adb7afac 100644
--- a/supervisor/supervisor.py
+++ b/supervisor/supervisor.py
@@ -143,7 +143,7 @@ class Supervisor(CoreSysAttributes):
         with TemporaryDirectory(dir=self.sys_config.path_tmp) as tmp_dir:
             profile_file = Path(tmp_dir, "apparmor.txt")
             try:
-                profile_file.write_text(data)
+                profile_file.write_text(data, encoding="utf-8")
             except OSError as err:
                 raise SupervisorAppArmorError(
                     f"Can't write temporary profile: {err!s}", _LOGGER.error
diff --git a/tests/common.py b/tests/common.py
index a326ab361..2f0149cf3 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -6,13 +6,13 @@ from pathlib import Path
 def load_json_fixture(filename: str) -> dict:
     """Load a json fixture."""
     path = Path(Path(__file__).parent.joinpath("fixtures"), filename)
-    return json.loads(path.read_text())
+    return json.loads(path.read_text(encoding="utf-8"))
 
 
 def load_fixture(filename: str) -> str:
     """Load a fixture."""
     path = Path(Path(__file__).parent.joinpath("fixtures"), filename)
-    return path.read_text()
+    return path.read_text(encoding="utf-8")
 
 
 def exists_fixture(filename: str) -> bool: