diff --git a/optik/common/abi.py b/optik/common/abi.py
index 2aa7ab1..148bbf9 100644
--- a/optik/common/abi.py
+++ b/optik/common/abi.py
@@ -1,7 +1,7 @@
 from itertools import accumulate
 from typing import List, Union, Any, Optional
 
-import sha3
+from Crypto.Hash import keccak
 from eth_abi.exceptions import ABITypeError, ParseError
 from eth_abi.grammar import ABIType, BasicType, TupleType, parse, normalize
 from maat import Cst, Sext, Value, Var, VarContext
@@ -396,7 +396,7 @@ def func_signature(func_name: str, args_spec: str) -> str:
 
 def selector(function_signature: str) -> Value:
     """Return the first 4 bytes of the keccak256 hash of 'func_signature'"""
-    k = sha3.keccak_256()
+    k = keccak.new(digest_bits=256)
     k.update(function_signature.encode())
     digest = k.digest()[:4]
     return Cst(32, int.from_bytes(digest, "big"))
diff --git a/optik/common/util.py b/optik/common/util.py
index 4a7c8da..5391900 100644
--- a/optik/common/util.py
+++ b/optik/common/util.py
@@ -4,7 +4,7 @@
 import os
 
 import rlp
-import sha3
+from Crypto.Hash import keccak
 
 
 from .exceptions import GenericException
@@ -233,7 +233,7 @@ def compute_new_contract_addr(sender: int, nonce: int) -> int:
     """Compute a new contract address as generated by the CREATE instruction
     originating from 'sender' with nonce 'nonce'"""
 
-    k = sha3.keccak_256()
+    k = keccak.new(digest_bits=256)
     k.update(rlp.encode([sender.to_bytes(20, "big"), nonce]))
     digest = k.digest()[12:]
     return int.from_bytes(digest, "big")
diff --git a/pyproject.toml b/pyproject.toml
index 8061795..175724f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ dependencies = [
     "wheel",
     "pymaat>=0.6.7",
     "eth_abi",
-    "pysha3",
+    "pycryptodome>=3.4.6",
     "rlp",
     "crytic-compile",
     "slither-analyzer",