diff --git a/package-lock.json b/package-lock.json
index 46cc78e..cef8864 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
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@@ -4342,6 +4249,23 @@
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@@ -4596,14 +4520,6 @@
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@@ -4999,26 +4915,6 @@
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     "web3-shh": {
@@ -5061,6 +4957,35 @@
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+    "websocket": {
+      "version": "github:web3-js/WebSocket-Node#905deb4812572b344f5801f8c9ce8bb02799d82e",
+      "from": "github:web3-js/WebSocket-Node#polyfill/globalThis",
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+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
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diff --git a/package.json b/package.json
index b3d10a8..c148b12 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rouge-protocol-solidity",
-  "version": "0.21.1",
+  "version": "0.21.0",
   "description": "Solidity contracts for the Rouge protocol (voucher, coupon, ticket, note on Ethereum)",
   "main": "",
   "files": [
@@ -39,11 +39,11 @@
     "access": "public"
   },
   "devDependencies": {
-    "@openzeppelin/contracts": "^2.4.0",
-    "@truffle/contract": "^4.0.38",
+    "@openzeppelin/contracts": "2.4.0",
+    "@truffle/contract": "^4.1.9",
     "ethereumjs-abi": "^0.6.8",
-    "ethereumjs-util": "^6.1.0",
+    "ethereumjs-util": "^6.2.0",
     "release-it": "^12.4.3",
-    "truffle": "^5.0.43"
+    "truffle": "^5.1.13"
   }
 }
diff --git a/test/BridgeRGEToken.js b/test/BridgeRGEToken.js
index 8ece1cb..28fb5f0 100644
--- a/test/BridgeRGEToken.js
+++ b/test/BridgeRGEToken.js
@@ -57,7 +57,7 @@ contract('BridgeRGEToken', function(accounts) {
 
     await bridge.adminBridge(foreign_network, true, home_validator, foreign_validator)
 
-    const tx = await bridge.deposit(deposit, foreign_network, {from: user, gas: 67431 +20000, gasPrice: web3.utils.toWei('1', "gwei")})
+    const tx = await bridge.deposit(deposit, foreign_network, {from: user, gas: 67431 +30000, gasPrice: web3.utils.toWei('1', "gwei")})
     const depositBlock = tx.receipt.blockNumber;
 
     const lockHash = createLockHash(user, deposit, foreign_network, bridge.address, depositBlock)
diff --git a/test/RougeBridge.js b/test/RougeBridge.js
index 62c89a4..6b57a8c 100644
--- a/test/RougeBridge.js
+++ b/test/RougeBridge.js
@@ -98,7 +98,7 @@ contract('RougeBridge', function(accounts) {
 
     await bridge.adminBridge(foreign_network, true, home_validator, foreign_validator)
 
-    const tx = await bridge.deposit(deposit, foreign_network, {from: user, gas: 67431 +20000, gasPrice: web3.utils.toWei('1', "gwei")})
+    const tx = await bridge.deposit(deposit, foreign_network, {from: user, gas: 67431 +30000, gasPrice: web3.utils.toWei('1', "gwei")})
     const depositBlock = tx.receipt.blockNumber;
 
     // foreign chain + owner locking fct
diff --git a/test/RougeFactory.js b/test/RougeFactory.js
index 2fb181e..6ae2306 100644
--- a/test/RougeFactory.js
+++ b/test/RougeFactory.js
@@ -43,7 +43,7 @@ contract('RougeFactory', function(accounts) {
 
     const tx = await rge.newCampaign(issuance, deposit, {from: issuer, gas: estimate, gasPrice: web3.utils.toWei('1', "gwei")})
 
-    assert.isBelow(estimate - tx.receipt.cumulativeGasUsed, 70000, "cumulativeGasUsed mostly predict");
+    assert.isBelow(estimate - tx.receipt.cumulativeGasUsed, 80000, `cumulativeGasUsed mostly predict estimate ${estimate}`);
 
     const campaign_address = tx.receipt.logs[1].args.to;
 
diff --git a/test/utils.js b/test/utils.js
index 34e29ae..c62923d 100644
--- a/test/utils.js
+++ b/test/utils.js
@@ -58,7 +58,7 @@ function authHash (msg, campaign, bearer) {
 
 function protocolSig (account, hash, prefix = 'Rouge ID: ') {
   const signature = ethUtils.ecsign(ethUtils.hashPersonalMessage(
-    ethUtils.toBuffer(prefix + hash.substr(2))
+    ethUtils.toBuffer(ethUtils.bufferToHex( Buffer.from(prefix + hash.substr(2))))
   ), ethUtils.toBuffer('0x' + privateKey[account.toLowerCase()]))
   return {
     r: ethUtils.bufferToHex(signature.r),