diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..23e837d
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2300 @@
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+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
+    "ws": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
+      "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
+      "requires": {
+        "async-limiter": "1.0.0",
+        "safe-buffer": "5.1.1",
+        "ultron": "1.1.1"
+      }
+    },
+    "x-address-codec": {
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/x-address-codec/-/x-address-codec-0.7.2.tgz",
+      "integrity": "sha1-Ki97sAJ4UgvRNzOnlZoFRD1oAuA=",
+      "requires": {
+        "base-x": "1.1.0"
+      },
+      "dependencies": {
+        "base-x": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/base-x/-/base-x-1.1.0.tgz",
+          "integrity": "sha1-QtPXF0dPnqAiB/bRqh9CaRPut6w="
+        }
+      }
+    },
+    "xregexp": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/xregexp/-/xregexp-2.0.0.tgz",
+      "integrity": "sha1-UqY+VsoLhKfzpfPWGHLxJq16WUM="
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+    }
+  }
+}
diff --git a/package.json b/package.json
index 9b60b68..2cb3de6 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {},
   "dependencies": {
     "bignumber.js": "^2.3.0",
-    "bitgo": "~2.2.4",
+    "bitgo": "^4.18.1",
     "lamassu-config": "^0.4.4",
     "lodash": "^2.4.1",
     "promptly": "~0.2.0"
diff --git a/wallet.js b/wallet.js
index dba0d44..c6a3082 100644
--- a/wallet.js
+++ b/wallet.js
@@ -34,16 +34,30 @@ exports.config = function config (localConfig) {
 exports.sendBitcoins = function sendBitcoins (address, satoshis, fee, callback) {
   return getWallet()
     .then(function (wallet) {
-      var params = {
+      var paramsForFeeCalculation = {
         address: address,
         amount: satoshis,
-        // fee: fee,  // TODO: support fee in sendCoins
-        walletPassphrase: pluginConfig.walletPassphrase,
+        targetWalletUnspents: 1, // UTXOs management
+        feeTxConfirmTarget: 6, // Calculate fees dinamically by block target
+        maxFeeRate: 500000 // add a sane limit for the fee rate in case the network fee would go crazy
         // minConfirms: 1, // avoid spending malleated inputs
         // enforceMinConfirmsForChange: true, // avoid spending malleated change txs
-        targetWalletUnspents: 4, // ensures the BitGo wallet has plenty of UTXOs to perform multiple transactions safely within a single block confirmation time window
-        feeTxConfirmTarget: 2, // Calculate fees dinamically so tx arrives in seconds block
-        maxFeeRate: 300000 // add a sane limit for the fee rate in case the network fee would go crazy
+      }
+
+      // Build transaction to get an accurate current fee estimate
+      return wallet.createTransaction(paramsForFeeCalculation)
+    })
+    .then(function(err, transaction) {
+      var fee = transaction.fee
+      var amountToSend = satoshis - fee
+      var params = {
+        address: address,
+        amount: amountToSend,
+        fee: transaction.fee,
+        walletPassphrase: pluginConfig.walletPassphrase,
+        targetWalletUnspents: 1
+        // minConfirms: 0,
+        // enforceMinConfirmsForChange: true,
       }
       return wallet.sendCoins(params)
     })