diff --git a/mev_inspect/fees.py b/mev_inspect/fees.py
index 2b4d35a..0a2d1f6 100644
--- a/mev_inspect/fees.py
+++ b/mev_inspect/fees.py
@@ -2,7 +2,7 @@ from web3 import Web3
 
 
 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")