diff --git a/pom.xml b/pom.xml
index 8a21faa..037064c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2,7 +2,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.yahoo.bullet</groupId>
     <artifactId>bullet-spark</artifactId>
-    <version>1.0.5-SNAPSHOT</version>
+    <version>1.1.0-SNAPSHOT</version>
     <packaging>jar</packaging>
     <name>bullet-spark</name>
 
@@ -54,8 +54,8 @@
         <scala.dep.version>2.12</scala.dep.version>
         <scoverage.plugin.version>1.3.0</scoverage.plugin.version>
         <spark.version>3.0.1</spark.version>
-        <bullet.core.version>1.3.1</bullet.core.version>
-        <bullet.dsl.version>1.1.6</bullet.dsl.version>
+        <bullet.core.version>1.4.2</bullet.core.version>
+        <bullet.dsl.version>1.1.7</bullet.dsl.version>
         <avro.version>1.9.2</avro.version>
         <kafka.clients.version>2.6.0</kafka.clients.version>
         <pulsar.client.version>2.2.1</pulsar.client.version>
diff --git a/src/main/scala/com/yahoo/bullet/spark/QueryDataUnioning.scala b/src/main/scala/com/yahoo/bullet/spark/QueryDataUnioning.scala
index 2316c3f..0e95985 100644
--- a/src/main/scala/com/yahoo/bullet/spark/QueryDataUnioning.scala
+++ b/src/main/scala/com/yahoo/bullet/spark/QueryDataUnioning.scala
@@ -6,7 +6,7 @@
 package com.yahoo.bullet.spark
 
 import com.yahoo.bullet.pubsub.Metadata.Signal
-import com.yahoo.bullet.pubsub.PubSubMessage
+import com.yahoo.bullet.pubsub.{PubSubMessage, PubSubMessageSerDe}
 import com.yahoo.bullet.record.BulletRecord
 import com.yahoo.bullet.spark.data.{BulletData, BulletErrorData, BulletSignalData, RunningQueryData}
 import com.yahoo.bullet.spark.utils.{BulletSparkConfig, BulletSparkUtils}
@@ -40,8 +40,9 @@ object QueryDataUnioning {
                                        ): DStream[(String, BulletData)] = {
     // Create (id, BulletData) pairs out of the queries.
     val metrics = BulletSparkMetrics.getInstance(ssc, broadcastedConfig)
+    val messageSerDe = PubSubMessageSerDe.from(broadcastedConfig.value)
     val queryPairStream = queryStream.map(m => {
-      val output = (m.getId, BulletSparkUtils.createBulletData(m, broadcastedConfig))
+      val output = (m.getId, BulletSparkUtils.createBulletData(messageSerDe.fromMessage(m), broadcastedConfig))
       if (!output._2.isInstanceOf[BulletSignalData]) {
         BulletSparkMetrics.newQueryReceived(metrics)
       }
diff --git a/src/main/scala/com/yahoo/bullet/spark/utils/BulletSparkUtils.scala b/src/main/scala/com/yahoo/bullet/spark/utils/BulletSparkUtils.scala
index 1df44dc..04502e4 100644
--- a/src/main/scala/com/yahoo/bullet/spark/utils/BulletSparkUtils.scala
+++ b/src/main/scala/com/yahoo/bullet/spark/utils/BulletSparkUtils.scala
@@ -9,10 +9,9 @@ package com.yahoo.bullet.spark.utils
 import scala.collection.JavaConverters._
 // scalastyle:on
 
-import com.yahoo.bullet.common.{BulletError, SerializerDeserializer}
+import com.yahoo.bullet.common.BulletError
 import com.yahoo.bullet.pubsub.Metadata.Signal
 import com.yahoo.bullet.pubsub.{Metadata, PubSubMessage}
-import com.yahoo.bullet.query.Query
 import com.yahoo.bullet.querying.{Querier, RateLimitError, RunningQuery}
 import com.yahoo.bullet.result.{Clip, Meta}
 import com.yahoo.bullet.spark.data.{BulletData, BulletErrorData, BulletSignalData, QuerierData, RunningQueryData}
@@ -27,7 +26,6 @@ object BulletSparkUtils {
    */
   def createBulletData(pubSubMessage: PubSubMessage, broadcastedConfig: Broadcast[BulletSparkConfig]): BulletData = {
     val id = pubSubMessage.getId
-    val content = pubSubMessage.getContent
     val metadata = pubSubMessage.getMetadata
     val config = broadcastedConfig.value
     try {
@@ -35,7 +33,7 @@ object BulletSparkUtils {
       if (signal != null && signal == Metadata.Signal.KILL || signal == Metadata.Signal.COMPLETE) {
         new BulletSignalData(metadata, signal)
       } else {
-        val query: Query = SerializerDeserializer.fromBytes(content)
+        val query = pubSubMessage.getContentAsQuery
         val runningQuery = new RunningQuery(id, query, metadata)
         new RunningQueryData(metadata, runningQuery)
       }
diff --git a/src/test/scala/com/yahoo/bullet/spark/QueryDataUnioningTest.scala b/src/test/scala/com/yahoo/bullet/spark/QueryDataUnioningTest.scala
index 33a2424..efa708a 100644
--- a/src/test/scala/com/yahoo/bullet/spark/QueryDataUnioningTest.scala
+++ b/src/test/scala/com/yahoo/bullet/spark/QueryDataUnioningTest.scala
@@ -5,12 +5,10 @@
  */
 package com.yahoo.bullet.spark
 
-import com.yahoo.bullet.common.SerializerDeserializer
-
 import scala.collection.mutable
 import scala.collection.mutable.ListBuffer
 import com.yahoo.bullet.pubsub.Metadata.Signal
-import com.yahoo.bullet.pubsub.{Metadata, PubSubMessage}
+import com.yahoo.bullet.pubsub.{ByteArrayPubSubMessageSerDe, PubSubMessage}
 import com.yahoo.bullet.query.{Projection, Query, Window}
 import com.yahoo.bullet.query.QueryUtils.makeFieldFilterQuery
 import com.yahoo.bullet.query.aggregations.Raw
@@ -19,7 +17,7 @@ import com.yahoo.bullet.spark.utils.{BulletSparkConfig, BulletSparkUtils}
 import org.apache.spark.rdd.RDD
 
 class QueryDataUnioningTest extends BulletSparkTest {
-  private val metadata = new Metadata()
+  private val messageSerDe = new ByteArrayPubSubMessageSerDe(new BulletSparkConfig("src/test/resources/test_config.yaml"))
 
   behavior of "The query data unioning stage"
 
@@ -38,9 +36,10 @@ class QueryDataUnioningTest extends BulletSparkTest {
     ssc.start()
 
     val query = makeFieldFilterQuery("b235gf23b")
-    val pubSubMessage1 = new PubSubMessage("id1", SerializerDeserializer.toBytes(query), metadata)
+    val pubSubMessage1 = messageSerDe.toMessage("id1", query, null)
     // Json parsing error.
-    val pubSubMessage2 = new PubSubMessage("id2", "This is a json parsing error pubsub message.")
+    val pubSubMessage2 = messageSerDe.toMessage("id2", null, null)
+    pubSubMessage2.setContent("This is a query deserialization error.")
     inputQueries += sc.makeRDD(Seq(pubSubMessage1, pubSubMessage2))
     wait1second() // T = 1s
 
@@ -92,7 +91,7 @@ class QueryDataUnioningTest extends BulletSparkTest {
     ssc.start()
 
     val query = new Query(new Projection(), null, new Raw(1), null, new Window(), 1L)
-    val pubSubMessage1 = new PubSubMessage("id1", SerializerDeserializer.toBytes(query), metadata)
+    val pubSubMessage1 = messageSerDe.toMessage("id1", query, null)
     inputQueries += sc.makeRDD(Seq(pubSubMessage1))
     wait1second() // T = 1s