diff --git a/contracts/ERC20Tornado.sol b/contracts/ERC20Tornado.sol
index a0221a0..5ab8829 100644
--- a/contracts/ERC20Tornado.sol
+++ b/contracts/ERC20Tornado.sol
@@ -18,7 +18,7 @@ import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
 
 contract ERC20Tornado is Tornado {
   using SafeERC20 for IERC20;
-  IERC20 public immutable token;
+  IERC20 public token;
 
   constructor(
     IVerifier _verifier,
diff --git a/contracts/MerkleTreeWithHistory.sol b/contracts/MerkleTreeWithHistory.sol
index 05f4741..4d6a5a6 100644
--- a/contracts/MerkleTreeWithHistory.sol
+++ b/contracts/MerkleTreeWithHistory.sol
@@ -19,9 +19,9 @@ interface IHasher {
 contract MerkleTreeWithHistory {
   uint256 public constant FIELD_SIZE = 21888242871839275222246405745257275088548364400416034343698204186575808495617;
   uint256 public constant ZERO_VALUE = 21663839004416932945382355908790599225266501822907911457504978515578255421292; // = keccak256("tornado") % FIELD_SIZE
-
   IHasher public immutable hasher;
-  uint32 public immutable levels;
+
+  uint32 public levels;
 
   // the following variables are made public for easier testing and debugging and
   // are not supposed to be accessed in regular code
diff --git a/contracts/Tornado.sol b/contracts/Tornado.sol
index 6459d49..278ceb7 100644
--- a/contracts/Tornado.sol
+++ b/contracts/Tornado.sol
@@ -21,7 +21,7 @@ interface IVerifier {
 
 abstract contract Tornado is MerkleTreeWithHistory, ReentrancyGuard {
   IVerifier public immutable verifier;
-  uint256 public immutable denomination;
+  uint256 public denomination;
 
   mapping(bytes32 => bool) public nullifierHashes;
   // we store all commitments just to prevent accidental deposits with the same commitment