diff --git a/eth/rollup.go b/eth/rollup.go
index b293aba..c243532 100644
--- a/eth/rollup.go
+++ b/eth/rollup.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"math/big"
-	"strconv"
 	"strings"
 
 	"github.com/ethereum/go-ethereum"
@@ -157,7 +156,7 @@ type RollupUpdateBucketsParameters struct {
 }
 
 type rollupEventUpdateBucketsParametersAux struct {
-	ArrayBuckets [common.RollupConstNumBuckets][6]*big.Int
+	ArrayBuckets []*big.Int
 }
 
 // RollupEventUpdateBucketsParameters is an event of the Rollup Smart Contract
@@ -613,7 +612,7 @@ func (c *RollupClient) RollupUpdateBucketsParameters(
 	if tx, err = c.client.CallAuth(
 		12500000, //nolint:gomnd
 		func(ec *ethclient.Client, auth *bind.TransactOpts) (*types.Transaction, error) {
-			params := []*big.Int{}
+			params := make([]*big.Int, len(arrayBuckets))
 			for i, bucket := range arrayBuckets {
 				params[i], err = c.hermez.PackBucket(c.opts, bucket.CeilUSD, bucket.BlockStamp, bucket.Withdrawals, bucket.RateBlocks, bucket.RateWithdrawals, bucket.MaxWithdrawals)
 				if err != nil {
@@ -743,7 +742,7 @@ var (
 	logHermezUpdateWithdrawalDelay = crypto.Keccak256Hash([]byte(
 		"UpdateWithdrawalDelay(uint64)"))
 	logHermezUpdateBucketsParameters = crypto.Keccak256Hash([]byte(
-		"UpdateBucketsParameters(uint256[4][" + strconv.Itoa(common.RollupConstNumBuckets) + "])"))
+		"UpdateBucketsParameters(uint256[])"))
 	logHermezUpdateTokenExchange = crypto.Keccak256Hash([]byte(
 		"UpdateTokenExchange(address[],uint64[])"))
 	logHermezSafeMode = crypto.Keccak256Hash([]byte(
@@ -911,12 +910,16 @@ func (c *RollupClient) RollupEventsByBlock(blockNum int64,
 				return nil, tracerr.Wrap(err)
 			}
 			for i, bucket := range bucketsParametersAux.ArrayBuckets {
-				bucketsParameters.ArrayBuckets[i].CeilUSD = bucket[0]
-				bucketsParameters.ArrayBuckets[i].BlockStamp = bucket[1]
-				bucketsParameters.ArrayBuckets[i].Withdrawals = bucket[2]
-				bucketsParameters.ArrayBuckets[i].RateBlocks = bucket[3]
-				bucketsParameters.ArrayBuckets[i].RateWithdrawals = bucket[4]
-				bucketsParameters.ArrayBuckets[i].MaxWithdrawals = bucket[5]
+				bucket, err := c.hermez.UnpackBucket(c.opts, bucket)
+				if err != nil {
+					return nil, tracerr.Wrap(err)
+				}
+				bucketsParameters.ArrayBuckets[i].CeilUSD = bucket.CeilUSD
+				bucketsParameters.ArrayBuckets[i].BlockStamp = bucket.BlockStamp
+				bucketsParameters.ArrayBuckets[i].Withdrawals = bucket.Withdrawals
+				bucketsParameters.ArrayBuckets[i].RateBlocks = bucket.RateBlocks
+				bucketsParameters.ArrayBuckets[i].RateWithdrawals = bucket.RateWithdrawals
+				bucketsParameters.ArrayBuckets[i].MaxWithdrawals = bucket.MaxWithdrawals
 			}
 			rollupEvents.UpdateBucketsParameters =
 				append(rollupEvents.UpdateBucketsParameters, bucketsParameters)
diff --git a/eth/rollup_test.go b/eth/rollup_test.go
index a4efcec..aecf459 100644
--- a/eth/rollup_test.go
+++ b/eth/rollup_test.go
@@ -241,7 +241,7 @@ func TestRollupUpdateBucketsParameters(t *testing.T) {
 		bucketsParameters[i].Withdrawals = big.NewInt(int64(i + 1))
 		bucketsParameters[i].RateBlocks = big.NewInt(int64(i+1) * 4)
 		bucketsParameters[i].RateWithdrawals = big.NewInt(int64(3))
-		bucketsParameters[i].MaxWithdrawals = big.NewInt(int64(100000000000))
+		bucketsParameters[i].MaxWithdrawals = big.NewInt(int64(1215752192))
 	}
 	_, err := rollupClient.RollupUpdateBucketsParameters(bucketsParameters)
 	require.NoError(t, err)
@@ -250,7 +250,14 @@ func TestRollupUpdateBucketsParameters(t *testing.T) {
 	blockStampBucket = currentBlockNum
 	rollupEvents, err := rollupClient.RollupEventsByBlock(currentBlockNum, nil)
 	require.NoError(t, err)
-	assert.Equal(t, bucketsParameters, rollupEvents.UpdateBucketsParameters[0].ArrayBuckets)
+	for i := range bucketsParameters {
+		assert.Equal(t, 0, bucketsParameters[i].CeilUSD.Cmp(rollupEvents.UpdateBucketsParameters[0].ArrayBuckets[i].CeilUSD))
+		assert.Equal(t, 0, bucketsParameters[i].BlockStamp.Cmp(rollupEvents.UpdateBucketsParameters[0].ArrayBuckets[i].BlockStamp))
+		assert.Equal(t, 0, bucketsParameters[i].Withdrawals.Cmp(rollupEvents.UpdateBucketsParameters[0].ArrayBuckets[i].Withdrawals))
+		assert.Equal(t, 0, bucketsParameters[i].RateBlocks.Cmp(rollupEvents.UpdateBucketsParameters[0].ArrayBuckets[i].RateBlocks))
+		assert.Equal(t, 0, bucketsParameters[i].RateWithdrawals.Cmp(rollupEvents.UpdateBucketsParameters[0].ArrayBuckets[i].RateWithdrawals))
+		assert.Equal(t, 0, bucketsParameters[i].MaxWithdrawals.Cmp(rollupEvents.UpdateBucketsParameters[0].ArrayBuckets[i].MaxWithdrawals))
+	}
 }
 
 func TestRollupUpdateWithdrawalDelay(t *testing.T) {