diff --git a/mev_inspect/block.py b/mev_inspect/block.py
index cf80fa54..213dd60c 100644
--- a/mev_inspect/block.py
+++ b/mev_inspect/block.py
@@ -107,7 +107,7 @@ async def _fetch_block_timestamp(w3, block_number: int) -> int:
 
 
 async def _fetch_block_receipts(w3, block_number: int) -> List[Receipt]:
-    receipts_json = await w3.eth.get_block_receipts(block_number)
+    receipts_json = await w3.eth.get_block_receipts(hex(block_number))
     return [Receipt(**receipt) for receipt in receipts_json]
 
 
diff --git a/mev_inspect/fees.py b/mev_inspect/fees.py
index 2b4d35ad..0a2d1f61 100644
--- a/mev_inspect/fees.py
+++ b/mev_inspect/fees.py
@@ -2,7 +2,7 @@
 
 
 async def fetch_base_fee_per_gas(w3: Web3, block_number: int) -> int:
-    base_fees = await w3.eth.fee_history(1, block_number)
+    base_fees = await w3.eth.fee_history(1, block_number, [])
     base_fees_per_gas = base_fees["baseFeePerGas"]
     if len(base_fees_per_gas) == 0:
         raise RuntimeError("Unexpected error - no fees returned")