diff --git a/src/commons.ts b/src/commons.ts
index d169f0f..da6e84e 100644
--- a/src/commons.ts
+++ b/src/commons.ts
@@ -23,7 +23,6 @@ import {
   solidityPackedKeccak256,
   SigningKey,
   AbiCoder,
-  parseEther,
 } from 'ethers';
 
 import {