diff --git a/eth_validator_watcher/beacon.py b/eth_validator_watcher/beacon.py
index 5f9524c..8dec50f 100644
--- a/eth_validator_watcher/beacon.py
+++ b/eth_validator_watcher/beacon.py
@@ -240,7 +240,7 @@ def get_rewards(
         self,
         beacon_type: BeaconType,
         epoch: int,
-        validators_index: Optional[set[int]] = None,
+        validators_index: set[int] | None = None,
     ) -> Rewards:
         """Get rewards.
 
@@ -333,7 +333,7 @@ def get_validators_liveness(
 
         return {item.index: item.is_live for item in validators_liveness.data}
 
-    def get_potential_block(self, slot) -> Optional[Block]:
+    def get_potential_block(self, slot) -> Block | None:
         """Get a block if it exists, otherwise return None.
 
         Parameters:
diff --git a/eth_validator_watcher/entrypoint.py b/eth_validator_watcher/entrypoint.py
index 1b740b4..ddeb684 100644
--- a/eth_validator_watcher/entrypoint.py
+++ b/eth_validator_watcher/entrypoint.py
@@ -78,7 +78,8 @@
 def handler(
     beacon_url: str = Option(..., help="URL of beacon node", show_default=False),
     execution_url: str = Option(None, help="URL of execution node", show_default=False),
-    pubkeys_file_path: Optional[Path] = Option(
+    pubkeys_file_path: Path
+    | None = Option(
         None,
         help="File containing the list of public keys to watch",
         exists=True,
@@ -86,15 +87,18 @@ def handler(
         dir_okay=False,
         show_default=False,
     ),
-    web3signer_url: Optional[str] = Option(
+    web3signer_url: str
+    | None = Option(
         None, help="URL to web3signer managing keys to watch", show_default=False
     ),
-    fee_recipient: Optional[str] = Option(
+    fee_recipient: str
+    | None = Option(
         None,
         help="Fee recipient address - --execution-url must be set",
         show_default=False,
     ),
-    slack_channel: Optional[str] = Option(
+    slack_channel: str
+    | None = Option(
         None,
         help="Slack channel to send alerts - SLACK_TOKEN env var must be set",
         show_default=False,
@@ -116,9 +120,7 @@ def handler(
     relay_url: List[str] = Option(
         [], help="URL of allow listed relay", show_default=False
     ),
-    liveness_file: Optional[Path] = Option(
-        None, help="Liveness file", show_default=False
-    ),
+    liveness_file: Path | None = Option(None, help="Liveness file", show_default=False),
 ) -> None:
     """
     🚨 Ethereum Validator Watcher 🚨
@@ -188,14 +190,14 @@ def handler(
 
 def _handler(
     beacon_url: str,
-    execution_url: Optional[str],
-    pubkeys_file_path: Optional[Path],
-    web3signer_url: Optional[str],
-    fee_recipient: Optional[str],
-    slack_channel: Optional[str],
+    execution_url: str | None,
+    pubkeys_file_path: Path | None,
+    web3signer_url: str | None,
+    fee_recipient: str | None,
+    slack_channel: str | None,
     beacon_type: BeaconType,
     relays_url: List[str],
-    liveness_file: Optional[Path],
+    liveness_file: Path | None,
 ) -> None:
     """Just a wrapper to be able to test the handler function"""
     slack_token = environ.get("SLACK_TOKEN")
@@ -240,11 +242,11 @@ def _handler(
     exited_validators = ExitedValidators(slack)
     slashed_validators = SlashedValidators(slack)
 
-    last_missed_attestations_process_epoch: Optional[int] = None
-    last_rewards_process_epoch: Optional[int] = None
+    last_missed_attestations_process_epoch: int | None = None
+    last_rewards_process_epoch: int | None = None
 
-    previous_epoch: Optional[int] = None
-    last_processed_finalized_slot: Optional[int] = None
+    previous_epoch: int | None = None
+    last_processed_finalized_slot: int | None = None
 
     genesis = beacon.get_genesis()
 
diff --git a/eth_validator_watcher/exited_validators.py b/eth_validator_watcher/exited_validators.py
index 5911e63..f568034 100644
--- a/eth_validator_watcher/exited_validators.py
+++ b/eth_validator_watcher/exited_validators.py
@@ -1,7 +1,6 @@
 """Contains the ExitedValidators class, which is responsible for managing the exited
 validators."""
 
-from typing import Optional
 
 from prometheus_client import Gauge
 
@@ -17,13 +16,13 @@
 class ExitedValidators:
     """Exited validators abstraction."""
 
-    def __init__(self, slack: Optional[Slack]) -> None:
+    def __init__(self, slack: Slack | None) -> None:
         """Exited validators
 
         Parameters:
         slack: Optional slack client
         """
-        self.__our_exited_unslashed_indexes: Optional[set[int]] = None
+        self.__our_exited_unslashed_indexes: set[int] | None = None
         self.__slack = slack
 
     def process(
diff --git a/eth_validator_watcher/fee_recipient.py b/eth_validator_watcher/fee_recipient.py
index 636ceea..d3b3b40 100644
--- a/eth_validator_watcher/fee_recipient.py
+++ b/eth_validator_watcher/fee_recipient.py
@@ -1,6 +1,5 @@
 """Contains the logic to check if the fee recipient is the one expected."""
 
-from typing import Optional
 
 from prometheus_client import Counter
 
@@ -17,9 +16,9 @@
 def process_fee_recipient(
     block: Block,
     index_to_validator: dict[int, Validators.DataItem.Validator],
-    execution: Optional[Execution],
-    expected_fee_recipient: Optional[str],
-    slack: Optional[Slack],
+    execution: Execution | None,
+    expected_fee_recipient: str | None,
+    slack: Slack | None,
 ) -> None:
     """Check if the fee recipient is the one expected.
 
diff --git a/eth_validator_watcher/missed_attestations.py b/eth_validator_watcher/missed_attestations.py
index a84208d..d2b8e76 100644
--- a/eth_validator_watcher/missed_attestations.py
+++ b/eth_validator_watcher/missed_attestations.py
@@ -1,7 +1,6 @@
 """Contains the logic to check if the validators missed attestations."""
 
 import functools
-from typing import Optional, Set
 
 from prometheus_client import Gauge
 
@@ -87,8 +86,8 @@ def process_double_missed_attestations(
     previous_dead_indexes: set[int],
     epoch_to_index_to_validator_index: LimitedDict,
     epoch: int,
-    slack: Optional[Slack],
-) -> Set[int]:
+    slack: Slack | None,
+) -> set[int]:
     """Process double missed attestations.
 
     Parameters:
diff --git a/eth_validator_watcher/missed_blocks.py b/eth_validator_watcher/missed_blocks.py
index 7303124..7c5aec6 100644
--- a/eth_validator_watcher/missed_blocks.py
+++ b/eth_validator_watcher/missed_blocks.py
@@ -1,7 +1,6 @@
 """Contains functions to handle missed block proposals detection on head"""
 
 import functools
-from typing import Optional
 
 from prometheus_client import Counter
 
@@ -36,10 +35,10 @@
 
 def process_missed_blocks_head(
     beacon: Beacon,
-    potential_block: Optional[Block],
+    potential_block: Block | None,
     slot: int,
     our_pubkeys: set[str],
-    slack: Optional[Slack],
+    slack: Slack | None,
 ) -> bool:
     """Process missed block proposals detection at head
 
@@ -111,7 +110,7 @@ def process_missed_blocks_finalized(
     last_processed_finalized_slot: int,
     slot: int,
     our_pubkeys: set[str],
-    slack: Optional[Slack],
+    slack: Slack | None,
 ) -> int:
     """Process missed block proposals detection at finalized
 
diff --git a/eth_validator_watcher/models.py b/eth_validator_watcher/models.py
index 8be76f6..7e72d64 100644
--- a/eth_validator_watcher/models.py
+++ b/eth_validator_watcher/models.py
@@ -1,7 +1,6 @@
 """Contains the models for the validator watcher."""
 
 from enum import StrEnum
-from typing import Optional
 
 from pydantic import BaseModel
 
@@ -153,7 +152,7 @@ class EthGetBlockByHashRequest(BaseModel):
 class ExecutionBlock(BaseModel):
     class Result(BaseModel):
         class Transaction(BaseModel):
-            to: Optional[str]
+            to: str | None
 
         transactions: list[Transaction]
 
diff --git a/eth_validator_watcher/slashed_validators.py b/eth_validator_watcher/slashed_validators.py
index 2f3fdf0..f189629 100644
--- a/eth_validator_watcher/slashed_validators.py
+++ b/eth_validator_watcher/slashed_validators.py
@@ -1,8 +1,5 @@
 """Contains the SlashedValidators class, which is responsible for managing the slashed
 validators."""
-
-from typing import Optional
-
 from prometheus_client import Gauge
 
 from .models import Validators
@@ -22,14 +19,14 @@
 class SlashedValidators:
     """Slashed validators abstraction."""
 
-    def __init__(self, slack: Optional[Slack]) -> None:
+    def __init__(self, slack: Slack | None) -> None:
         """Slashed validators
 
         Parameters:
         slack: Optional slack client
         """
-        self.__total_exited_slashed_indexes: Optional[set[int]] = None
-        self.__our_exited_slashed_indexes: Optional[set[int]] = None
+        self.__total_exited_slashed_indexes: set[int] | None = None
+        self.__our_exited_slashed_indexes: set[int] | None = None
         self.__slack = slack
 
     def process(
diff --git a/eth_validator_watcher/utils.py b/eth_validator_watcher/utils.py
index f8af7c3..f1ecff5 100644
--- a/eth_validator_watcher/utils.py
+++ b/eth_validator_watcher/utils.py
@@ -184,8 +184,8 @@ def load_pubkeys_from_file(path: Path) -> set[str]:
 
 
 def get_our_pubkeys(
-    pubkeys_file_path: Optional[Path],
-    web3signer: Optional[Web3Signer],
+    pubkeys_file_path: Path | None,
+    web3signer: Web3Signer | None,
 ) -> set[str]:
     """Get our pubkeys
 
diff --git a/tests/entrypoint/test__handler.py b/tests/entrypoint/test__handler.py
index ea708c5..d960d47 100644
--- a/tests/entrypoint/test__handler.py
+++ b/tests/entrypoint/test__handler.py
@@ -2,15 +2,14 @@
 from pathlib import Path
 from typing import Iterator, Optional, Tuple
 
-from freezegun import freeze_time
-from pytest import raises
-from typer import BadParameter
-
 from eth_validator_watcher import entrypoint
 from eth_validator_watcher.entrypoint import _handler
 from eth_validator_watcher.models import BeaconType, Genesis, Validators
 from eth_validator_watcher.utils import LimitedDict, Slack
 from eth_validator_watcher.web3signer import Web3Signer
+from freezegun import freeze_time
+from pytest import raises
+from typer import BadParameter
 
 StatusEnum = Validators.DataItem.StatusEnum
 Validator = Validators.DataItem.Validator
@@ -199,7 +198,7 @@ def get_status_to_index_to_validator(
                 },
             }
 
-        def get_potential_block(self, slot: int) -> Optional[str]:
+        def get_potential_block(self, slot: int) -> str | None:
             assert slot in {63, 64}
             return "A BLOCK"
 
@@ -291,7 +290,7 @@ def process_missed_blocks_finalized(
 
     def process_suboptimal_attestations(
         beacon: Beacon,
-        potential_block: Optional[str],
+        potential_block: str | None,
         slot: int,
         index_to_validator: dict[int, Validator],
     ) -> set[int]:
@@ -308,7 +307,7 @@ def process_suboptimal_attestations(
 
     def process_missed_blocks(
         beacon: Beacon,
-        potential_block: Optional[str],
+        potential_block: str | None,
         slot: int,
         pubkeys: set[str],
         slack: Slack,
diff --git a/tests/rewards/test_process_rewards_net.py b/tests/rewards/test_process_rewards_net.py
index 43019ca..bf823cb 100644
--- a/tests/rewards/test_process_rewards_net.py
+++ b/tests/rewards/test_process_rewards_net.py
@@ -1,5 +1,4 @@
 from math import isclose
-from typing import Optional
 
 from eth_validator_watcher.models import BeaconType, Rewards, Validators
 from eth_validator_watcher.rewards import (
@@ -53,7 +52,7 @@ def get_rewards(
             self,
             beacon_type: BeaconType,
             epoch: int,
-            validators_index: Optional[set[int]] = None,
+            validators_index: set[int] | None = None,
         ) -> Rewards:
             assert isinstance(beacon_type, BeaconType)
             assert epoch == 40
@@ -184,7 +183,7 @@ def get_rewards(
             self,
             beacon_type: BeaconType,
             epoch: int,
-            validators_index: Optional[set[int]] = None,
+            validators_index: set[int] | None = None,
         ) -> Rewards:
             assert isinstance(beacon_type, BeaconType)
             assert epoch == 40
@@ -375,7 +374,7 @@ def get_rewards(
             self,
             beacon_type: BeaconType,
             epoch: int,
-            validators_index: Optional[set[int]] = None,
+            validators_index: set[int] | None = None,
         ) -> Rewards:
             assert isinstance(beacon_type, BeaconType)
             assert epoch == 40
diff --git a/tests/rewards/test_process_rewards_our.py b/tests/rewards/test_process_rewards_our.py
index b096967..0af2e26 100644
--- a/tests/rewards/test_process_rewards_our.py
+++ b/tests/rewards/test_process_rewards_our.py
@@ -1,5 +1,4 @@
 from math import isclose
-from typing import Optional
 
 from eth_validator_watcher.models import BeaconType, Rewards, Validators
 from eth_validator_watcher.rewards import (
@@ -27,7 +26,7 @@ def get_rewards(
             self,
             beacon_type: BeaconType,
             epoch: int,
-            validators_index: Optional[set[int]] = None,
+            validators_index: set[int] | None = None,
         ) -> Rewards:
             assert isinstance(beacon_type, BeaconType)
             assert epoch == 40
@@ -158,7 +157,7 @@ def get_rewards(
             self,
             beacon_type: BeaconType,
             epoch: int,
-            validators_index: Optional[set[int]] = None,
+            validators_index: set[int] | None = None,
         ) -> Rewards:
             assert isinstance(beacon_type, BeaconType)
             assert epoch == 40
@@ -349,7 +348,7 @@ def get_rewards(
             self,
             beacon_type: BeaconType,
             epoch: int,
-            validators_index: Optional[set[int]] = None,
+            validators_index: set[int] | None = None,
         ) -> Rewards:
             assert isinstance(beacon_type, BeaconType)
             assert epoch == 40