diff --git a/gnosis/eth/constants.py b/gnosis/eth/constants.py
index 52057883a..751ae5e19 100644
--- a/gnosis/eth/constants.py
+++ b/gnosis/eth/constants.py
@@ -1,4 +1,6 @@
-from eth.constants import SECPK1_N
+SECPK1_N = (
+    115792089237316195423570985008687907852837564279074904382605163141518161494337
+)
 
 NULL_ADDRESS: str = "0x" + "0" * 40
 SENTINEL_ADDRESS: str = "0x" + "0" * 39 + "1"
diff --git a/gnosis/safe/safe_creation_tx.py b/gnosis/safe/safe_creation_tx.py
index 0fe09dee5..6d8ecdf93 100644
--- a/gnosis/safe/safe_creation_tx.py
+++ b/gnosis/safe/safe_creation_tx.py
@@ -4,14 +4,13 @@
 from typing import Any, Dict, List, Optional, Tuple
 
 import rlp
-from eth.constants import SECPK1_N
 from eth.vm.forks.frontier.transactions import FrontierTransaction
 from eth_keys.exceptions import BadSignature
 from hexbytes import HexBytes
 from web3 import Web3
 from web3.contract import ContractConstructor
 
-from gnosis.eth.constants import GAS_CALL_DATA_BYTE, NULL_ADDRESS
+from gnosis.eth.constants import GAS_CALL_DATA_BYTE, NULL_ADDRESS, SECPK1_N
 from gnosis.eth.contracts import (
     get_erc20_contract,
     get_paying_proxy_contract,
diff --git a/gnosis/safe/tests/utils.py b/gnosis/safe/tests/utils.py
index c06202c37..2c5489181 100644
--- a/gnosis/safe/tests/utils.py
+++ b/gnosis/safe/tests/utils.py
@@ -2,11 +2,11 @@
 import random
 from logging import getLogger
 
-from eth.constants import SECPK1_N
 from web3 import Web3
 
 from gnosis.eth.tests.utils import send_tx
 
+from ...eth.constants import SECPK1_N
 from ..safe_creation_tx import SafeCreationTx
 
 logger = getLogger(__name__)
diff --git a/setup.py b/setup.py
index ce86b8a1e..73291ec81 100644
--- a/setup.py
+++ b/setup.py
@@ -11,8 +11,7 @@
 requirements = [
     "cached-property>=1.5; python_version < '3.8'",
     "eip712_structs",
-    "packaging",
-    "py-evm>=0.5.0a3",
+    "py-evm==0.5.0a3",
     "pysha3>=1.0.0",
     "requests>=2",
     "typing-extensions>=3.10; python_version < '3.8'",