diff --git a/_src/_assets/javascripts/page-getstarted.js b/_src/_assets/javascripts/page-getstarted.js
index 8611830..cb30ccb 100644
--- a/_src/_assets/javascripts/page-getstarted.js
+++ b/_src/_assets/javascripts/page-getstarted.js
@@ -116,7 +116,7 @@ window.addEventListener('DOMContentLoaded', function domload(event) {
         const messageFail = document.getElementsByClassName('message--fail')[0]
         const transactionLink = document.getElementsByClassName('transaction-link')[0]
 
-        conn.postTransaction(txSigned).then((response) => {
+        conn.postTransactionSync(txSigned).then((response) => {
             waiting.classList.add('hide')
             messageInitial.classList.add('hide')
             responseArea.classList.remove('hide')
diff --git a/_src/_guides/_tutorial-cryptoconditions.md b/_src/_guides/_tutorial-cryptoconditions.md
index 2ae5833..d386cec 100644
--- a/_src/_guides/_tutorial-cryptoconditions.md
+++ b/_src/_guides/_tutorial-cryptoconditions.md
@@ -78,8 +78,7 @@ let makeTransaction = BigchainDB.Transaction.makeCreateTransaction({
 const txSigned = BigchainDB.Transaction.signTransaction(makeTransaction, creator.privateKey)
 
 // Send the transaction to BigchainDB
-conn.postTransaction(txSigned)
-    .then(() => conn.pollStatusAndFetchTransaction(txSigned.id))
+conn.postTransactionCommit(txSigned)
     .then(res => {
         document.body.innerHTML +='<h3>Transaction created</h3>';
         document.body.innerHTML +=txSigned.id
@@ -127,8 +126,7 @@ function createPR() {
     createTranfer.inputs[0].fulfillment = fulfillmentUri
 
     // Post the transaction to BigchainDB
-    conn.postTransaction(createTranfer)
-        .then(() => conn.pollStatusAndFetchTransaction(createTranfer.id))
+    conn.postTransactionCommit(createTranfer)
         .then(res => {
           document.body.innerHTML +='<h3>Transaction created</h3>';
           document.body.innerHTML +=createTranfer.id
@@ -184,8 +182,7 @@ let createTranfer = BigchainDB.Transaction.makeTransferTransaction(
 const transferToProduction = BigchainDB.Transaction.signTransaction(createTranfer, QAperson.privateKey)
 
 // Send the transaction to BigchainDB
-conn.postTransaction(transferToProduction)
-    .then(() => conn.pollStatusAndFetchTransaction(transferToProduction.id))
+conn.postTransactionCommit(transferToProduction)
     .then(res => {
         document.body.innerHTML ='<h3>Transfer transaction created</h3>';
         document.body.innerHTML +=transferToProduction.id
@@ -230,8 +227,7 @@ let fulfillment = BigchainDB.Transaction.makeThresholdCondition(threshold, [fulf
 const fulfillmentUri = fulfillment.serializeUri()
 transferApprove.inputs[0].fulfillment = fulfillmentUri
 
-conn.postTransaction(transferApprove)
-    .then(() => conn.pollStatusAndFetchTransaction(transferApprove.id))
+conn.postTransactionCommit(transferApprove)
     .then(res => {
       document.body.innerHTML ='<h3>Transfer transaction created</h3>';
       document.body.innerHTML +=transferApprove.id
diff --git a/_src/_guides/tutorial-piece-of-art.md b/_src/_guides/tutorial-piece-of-art.md
index a98d76e..5fe18da 100644
--- a/_src/_guides/tutorial-piece-of-art.md
+++ b/_src/_guides/tutorial-piece-of-art.md
@@ -85,9 +85,7 @@ function createPaint() {
         alice.privateKey)
 
     // Send the transaction off to BigchainDB
-    conn.postTransaction(txSigned)
-        // Check the status of the transaction
-        .then(() => conn.pollStatusAndFetchTransaction(txSigned.id))
+    conn.postTransactionCommit(txSigned)
         .then(res => {
             document.body.innerHTML += '<h3>Transaction created</h3>';
             document.body.innerHTML += txSigned.id
@@ -134,10 +132,8 @@ function transferOwnership(txCreatedID, newOwner) {
             // Sign with the key of the owner of the painting (Alice)
             const signedTransfer = BigchainDB.Transaction
                 .signTransaction(createTranfer, alice.privateKey)
-            return conn.postTransaction(signedTransfer)
+            return conn.postTransactionCommit(signedTransfer)
         })
-        .then((signedTransfer) => conn
-            .pollStatusAndFetchTransaction(signedTransfer.id))
         .then(res => {
             document.body.innerHTML += '<h3>Transfer Transaction created</h3>'
             document.body.innerHTML += res.id
diff --git a/_src/_guides/tutorial-rbac.md b/_src/_guides/tutorial-rbac.md
index 38d1058..b3697ac 100644
--- a/_src/_guides/tutorial-rbac.md
+++ b/_src/_guides/tutorial-rbac.md
@@ -83,8 +83,7 @@ async function createNewAsset(keypair, asset, metadata) {
     const txSigned = BigchainDB.Transaction.signTransaction(transaction,
         keypair.privateKey)
     let tx
-    await conn.postTransaction(txSigned)
-        .then(() => conn.pollStatusAndFetchTransaction(txSigned.id))
+    await conn.postTransactionCommit(txSigned)
         .then(retrievedTx => {
             tx = retrievedTx
         })
diff --git a/_src/_guides/tutorial-token-launch.md b/_src/_guides/tutorial-token-launch.md
index d12c6c8..fbf68a8 100644
--- a/_src/_guides/tutorial-token-launch.md
+++ b/_src/_guides/tutorial-token-launch.md
@@ -60,8 +60,7 @@ function tokenLaunch() {
       .signTransaction(tx, tokenCreator.privateKey)
 
     // Send the transaction off to BigchainDB
-    conn.postTransaction(txSigned)
-        .then(() => conn.pollStatusAndFetchTransaction(txSigned.id))
+    conn.postTransactionCommit(txSigned)
         .then(res => {
             tokensLeft = nTokens
             document.body.innerHTML ='<h3>Transaction created</h3>';
@@ -128,10 +127,8 @@ function transferTokens() {
             const signedTransfer = BigchainDB.Transaction
                 .signTransaction(createTranfer, tokenCreator.privateKey)
 
-            return conn.postTransaction(signedTransfer)
+            return conn.postTransactionCommit(signedTransfer)
         })
-        .then((signedTransfer) => conn
-            .pollStatusAndFetchTransaction(signedTransfer.id))
         .then(res => {
             // Update tokensLeft
             tokensLeft -= amountToSend
@@ -175,7 +172,7 @@ function combineTokens(transaction1, outputIndex1, transaction2, outputIndex2,
     const signedTransfer = BigchainDB.Transaction
         .signTransaction(combineTranfer, newUser.privateKey)
 
-    return conn.postTransaction(signedTransfer)
+    return conn.postTransactionCommit(signedTransfer)
 
 }
 ```
diff --git a/_src/getstarted.html b/_src/getstarted.html
index 42f206f..97732e6 100644
--- a/_src/getstarted.html
+++ b/_src/getstarted.html
@@ -121,7 +121,7 @@ const tx = driver.Transaction.makeCreateTransaction(
         driver.Transaction.makeEd25519Condition(alice.publicKey))],
     alice.publicKey)
 const txSigned = driver.Transaction.signTransaction(tx, alice.privateKey)
-conn.postTransaction(txSigned)
+conn.postTransactionSync(txSigned)
 ```
 {% endcapture %}{{ nodejs | markdownify }}
                 </div>
diff --git a/package.json b/package.json
index 3d1e173..1817eed 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "ie >= 10"
   ],
   "dependencies": {
-    "bigchaindb-driver": "3.2.0",
+    "bigchaindb-driver": "^4.0.0",
     "clipboard": "^2.0.0",
     "gumshoe": "github:cferdinandi/gumshoe",
     "is-in-viewport": "^3.0.0",