diff --git a/src/signing/index.ts b/src/signing/index.ts
index ff6b3180..1263f010 100644
--- a/src/signing/index.ts
+++ b/src/signing/index.ts
@@ -5,7 +5,7 @@ import { Adapter } from './adapters/types'
 import { EncMsg, ValidatorInfo } from '../types'
 import { stripHexPrefix, sendHttpPost } from '../utils'
 import { crypto, CryptoLib } from '../utils/crypto'
-import { Transaction } from 'ethers'
+import { Transaction } from 'ethereumjs-tx'
 
 export interface Config {
   signer: Signer
diff --git a/tests/testing-utils/constants.ts b/tests/testing-utils/constants.ts
index f1f00615..2731e953 100644
--- a/tests/testing-utils/constants.ts
+++ b/tests/testing-utils/constants.ts
@@ -1,4 +1,3 @@
-import { BigNumber, ethers } from 'ethers'
 
 export const x25519_public_key_alice =
   '0x0ac029f0b853b23bed652d6d0de69b7cc38d94f93732eefc85b5861e90f73a22'