diff --git a/src/evmasm.js b/src/evmasm.js
index d68f791..351201b 100644
--- a/src/evmasm.js
+++ b/src/evmasm.js
@@ -3,7 +3,7 @@
 //
 
 
-const Web3 = require("web3");
+const Web3Utils = require("web3-utils");
 const assert = require("assert");
 
 class Contract {
@@ -39,7 +39,7 @@ class Contract {
             genLoadedLength = C.code.length;
         }
 
-        return Web3.utils.bytesToHex(C.code.concat(this.code));
+        return Web3Utils.bytesToHex(C.code.concat(this.code));
     }
 
     stop() { this.code.push(0x00); }
@@ -149,7 +149,7 @@ class Contract {
     }
 
     push(data) {
-        const d = Web3.utils.hexToBytes(Web3.utils.toHex(data));
+        const d = Web3Utils.hexToBytes(Web3Utils.toHex(data));
         assert(d.length>0);
         assert(d.length<=32);
         this.code = this.code.concat([0x5F + d.length], d);
diff --git a/src/mimc7.js b/src/mimc7.js
index dda4b07..47291d8 100644
--- a/src/mimc7.js
+++ b/src/mimc7.js
@@ -1,6 +1,6 @@
 const bn128 = require("snarkjs").bn128;
 const bigInt = require("snarkjs").bigInt;
-const Web3 = require("web3");
+const Web3Utils = require("web3-utils");
 const F = bn128.Fr;
 
 const SEED = "mimc";
@@ -8,8 +8,8 @@ const NROUNDS = 91;
 
 exports.getIV = (seed) => {
     if (typeof seed === "undefined") seed = SEED;
-    const c = Web3.utils.keccak256(seed+"_iv");
-    const cn = bigInt(Web3.utils.toBN(c).toString());
+    const c = Web3Utils.keccak256(seed+"_iv");
+    const cn = bigInt(Web3Utils.toBN(c).toString());
     const iv = cn.mod(F.q);
     return iv;
 };
@@ -18,13 +18,13 @@ exports.getConstants = (seed, nRounds) => {
     if (typeof seed === "undefined") seed = SEED;
     if (typeof nRounds === "undefined") nRounds = NROUNDS;
     const cts = new Array(nRounds);
-    let c = Web3.utils.keccak256(SEED);
+    let c = Web3Utils.keccak256(SEED);
     for (let i=1; i<nRounds; i++) {
-        c = Web3.utils.keccak256(c);
+        c = Web3Utils.keccak256(c);
 
-        const n1 = Web3.utils.toBN(c).mod(Web3.utils.toBN(F.q.toString()));
-        const c2 = Web3.utils.padLeft(Web3.utils.toHex(n1), 64);
-        cts[i] = bigInt(Web3.utils.toBN(c2).toString());
+        const n1 = Web3Utils.toBN(c).mod(Web3Utils.toBN(F.q.toString()));
+        const c2 = Web3Utils.padLeft(Web3Utils.toHex(n1), 64);
+        cts[i] = bigInt(Web3Utils.toBN(c2).toString());
     }
     cts[0] = bigInt(0);
     return cts;
diff --git a/src/mimc_gencontract.js b/src/mimc_gencontract.js
index b226afa..f479374 100644
--- a/src/mimc_gencontract.js
+++ b/src/mimc_gencontract.js
@@ -2,13 +2,13 @@
 // License: LGPL-3.0+
 //
 
-const Web3 = require("web3");
+const Web3Utils = require("web3-utils");
 
 const Contract = require("./evmasm");
 
 function createCode(seed, n) {
 
-    let ci = Web3.utils.keccak256(seed);
+    let ci = Web3Utils.keccak256(seed);
 
     const C = new Contract();
 
@@ -51,7 +51,7 @@ function createCode(seed, n) {
     C.mulmod();         // r=t^7 k q
 
     for (let i=0; i<n-1; i++) {
-        ci = Web3.utils.keccak256(ci);
+        ci = Web3Utils.keccak256(ci);
         C.dup(2);       // q r k q
         C.dup(0);       // q q r k q
         C.dup(0);       // q q q r k q