diff --git a/mev_inspect/block.py b/mev_inspect/block.py
index cf80fa5..213dd60 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]