diff --git a/storb/challenge/__init__.py b/storb/challenge/__init__.py
index fac069f..9048bc1 100644
--- a/storb/challenge/__init__.py
+++ b/storb/challenge/__init__.py
@@ -190,7 +190,7 @@ def serialize_prf_value(self, prf_value: bytes) -> str:
         return base64.b64encode(prf_value).decode("utf-8")
 
     @field_validator("prf_value", mode="before")
-    def deserialize_prf_value(cls, value):
+    def deserialize_prf_value(self, value):
         """Deserialize PRF value from base64."""
 
         if isinstance(value, str):
@@ -292,7 +292,7 @@ def serialize_prf_key(self, prf_key: bytes) -> str:
         return prf_key
 
     @field_validator("prf_key", mode="before")
-    def deserialize_prf_key(cls, value):
+    def deserialize_prf_key(self, value):
         """Deserialize PRF key from base64."""
 
         if isinstance(value, str):
@@ -304,7 +304,7 @@ def deserialize_prf_key(cls, value):
         return value
 
     @field_validator("prp_key", mode="before")
-    def deserialize_prp_key(cls, value):
+    def deserialize_prp_key(self, value):
         """Deserialize PRP key from base64."""
 
         if isinstance(value, str):
diff --git a/storb/miner/__main__.py b/storb/miner/__main__.py
index 0be648a..53be9f8 100644
--- a/storb/miner/__main__.py
+++ b/storb/miner/__main__.py
@@ -1,9 +1,8 @@
 import asyncio
 import time
 
-from storb.util.logging import get_logger
-
 from storb.miner import Miner
+from storb.util.logging import get_logger
 
 logger = get_logger(__name__)
 
diff --git a/storb/util/message_signing.py b/storb/util/message_signing.py
index b82d48a..4bb63b0 100644
--- a/storb/util/message_signing.py
+++ b/storb/util/message_signing.py
@@ -1,5 +1,4 @@
 from binascii import unhexlify
-from typing import Union
 
 from pydantic import BaseModel
 from substrateinterface import Keypair
diff --git a/storb/util/uids.py b/storb/util/uids.py
index 44a1bc0..a8f8064 100644
--- a/storb/util/uids.py
+++ b/storb/util/uids.py
@@ -1,6 +1,5 @@
 import random
 
-import numpy as np
 from fiber.chain.metagraph import Metagraph
 
 from storb.neuron import Neuron