diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8b663d4d2..ce32863f0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v2
         with:
-          node-version: '16'
+          node-version: '20'
       - name: Cache node_modules
         uses: actions/cache@v2
         env:
@@ -37,7 +37,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v2
         with:
-          node-version: '16'
+          node-version: '20'
       - name: Cache node_modules
         uses: actions/cache@v2
         env:
@@ -83,7 +83,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v2
         with:
-          node-version: '16'
+          node-version: '20'
       - name: Cache node_modules
         uses: actions/cache@v2
         env:
@@ -155,7 +155,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        node: ['15', '16']
+        node: ['20', '18']
 
     steps:
       - uses: actions/checkout@v3
@@ -199,7 +199,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v2
         with:
-          node-version: '16'
+          node-version: '20'
 
       - name: checkout ocean.js repo
         uses: actions/checkout@v3
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 277bc9f22..91684ab5c 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v2
         with:
-          node-version: '16'
+          node-version: '20'
           registry-url: https://registry.npmjs.org/
       - run: npm ci
 
diff --git a/.nvmrc b/.nvmrc
index 19c7bdba7..2edeafb09 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-16
\ No newline at end of file
+20
\ No newline at end of file
diff --git a/src/utils/ContractUtils.ts b/src/utils/ContractUtils.ts
index 6d7be84c7..fa4e18b42 100644
--- a/src/utils/ContractUtils.ts
+++ b/src/utils/ContractUtils.ts
@@ -1,11 +1,13 @@
 import { ethers, Signer, providers, Contract, ContractFunction, BigNumber } from 'ethers'
 
 import { Config } from '../config'
-import { minAbi } from '.'
+import { LoggerInstance, minAbi } from '.'
 
 const MIN_GAS_FEE_POLYGON = 30000000000 // minimum recommended 30 gwei polygon main and mumbai fees
+const MIN_GAS_FEE_SEPOLIA = 4000000000 // minimum 4 gwei for eth sepolia testnet
 const POLYGON_NETWORK_ID = 137
 const MUMBAI_NETWORK_ID = 80001
+const SEPOLIA_NETWORK_ID = 11155111
 
 export function setContractDefaults(contract: Contract, config: Config): Contract {
   // TO DO - since ethers does not provide this
@@ -134,11 +136,18 @@ export async function sendTx(
         (chainId === MUMBAI_NETWORK_ID || chainId === POLYGON_NETWORK_ID) &&
         Number(aggressiveFeePriorityFeePerGas) < MIN_GAS_FEE_POLYGON
           ? MIN_GAS_FEE_POLYGON
+          : chainId === SEPOLIA_NETWORK_ID &&
+            Number(aggressiveFeePriorityFeePerGas) < MIN_GAS_FEE_SEPOLIA
+          ? MIN_GAS_FEE_SEPOLIA
           : Number(aggressiveFeePriorityFeePerGas),
+
       maxFeePerGas:
         (chainId === MUMBAI_NETWORK_ID || chainId === POLYGON_NETWORK_ID) &&
         Number(aggressiveFeePerGas) < MIN_GAS_FEE_POLYGON
           ? MIN_GAS_FEE_POLYGON
+          : chainId === SEPOLIA_NETWORK_ID &&
+            Number(aggressiveFeePerGas) < MIN_GAS_FEE_SEPOLIA
+          ? MIN_GAS_FEE_SEPOLIA
           : Number(aggressiveFeePerGas)
     }
   } else {
@@ -149,8 +158,10 @@ export async function sendTx(
   overrides.gasLimit = estGas.add(20000)
   try {
     const trxReceipt = await functionToSend(...args, overrides)
+    await trxReceipt.wait()
     return trxReceipt
   } catch (e) {
+    LoggerInstance.error('Send tx error: ', e)
     return null
   }
 }
diff --git a/test/integration/PublishEditConsume.test.ts b/test/integration/PublishEditConsume.test.ts
index 3569bd339..c140f6076 100644
--- a/test/integration/PublishEditConsume.test.ts
+++ b/test/integration/PublishEditConsume.test.ts
@@ -95,7 +95,7 @@ const grapqlFile: Files = {
   files: [
     {
       type: 'graphql',
-      url: 'https://v4.subgraph.goerli.oceanprotocol.com/subgraphs/name/oceanprotocol/ocean-subgraph',
+      url: 'https://v4.subgraph.sepolia.oceanprotocol.com/subgraphs/name/oceanprotocol/ocean-subgraph',
       query: `"
           query{
                 nfts(orderBy: createdTimestamp,orderDirection:desc){
@@ -392,7 +392,7 @@ describe('Publish consume test', async () => {
       providerUrl
     )
     assert(grapqlOrderTx, 'Ordering graphql dataset failed.')
-  })
+  }).timeout(40000)
 
   it('Should download the datasets files', async () => {
     const urlDownloadUrl = await ProviderInstance.getDownloadUrl(
diff --git a/test/integration/PublishFlows.test.ts b/test/integration/PublishFlows.test.ts
index 66af328e2..993756919 100644
--- a/test/integration/PublishFlows.test.ts
+++ b/test/integration/PublishFlows.test.ts
@@ -196,12 +196,12 @@ describe('Publish tests', async () => {
     )
   })
 
-  delay(10000)
+  delay(19000)
 
   it('should resolve the fixed price dataset', async () => {
     const resolvedDDO = await aquarius.waitForAqua(fixedPricedDID)
     assert(resolvedDDO, 'Cannot fetch DDO from Aquarius')
-  })
+  }).timeout(40000)
 
   it('should publish a dataset with dispenser (create NFT + Datatoken + dispenser) with no defined MetadataProof', async () => {
     const dispenserDdo: DDO = { ...genericAsset }
@@ -289,7 +289,7 @@ describe('Publish tests', async () => {
     )
   })
 
-  delay(10000)
+  delay(19000)
 
   it('should resolve the free dataset', async () => {
     const resolvedDDO = await aquarius.waitForAqua(dispenserDID)