diff --git a/src/main/java/io/cdap/plugin/gcp/bigquery/sink/BigQueryOutputFormat.java b/src/main/java/io/cdap/plugin/gcp/bigquery/sink/BigQueryOutputFormat.java
index 703f8b4849..8b415432df 100644
--- a/src/main/java/io/cdap/plugin/gcp/bigquery/sink/BigQueryOutputFormat.java
+++ b/src/main/java/io/cdap/plugin/gcp/bigquery/sink/BigQueryOutputFormat.java
@@ -37,6 +37,7 @@
 import com.google.api.services.bigquery.model.TableReference;
 import com.google.api.services.bigquery.model.TableSchema;
 import com.google.api.services.bigquery.model.TimePartitioning;
+import com.google.auth.Credentials;
 import com.google.cloud.bigquery.BigQuery;
 import com.google.cloud.bigquery.BigQueryException;
 import com.google.cloud.bigquery.BigQueryOptions;
@@ -62,6 +63,7 @@
 import com.google.common.base.Strings;
 import io.cdap.cdap.api.data.format.StructuredRecord;
 import io.cdap.plugin.gcp.bigquery.util.BigQueryConstants;
+import io.cdap.plugin.gcp.common.GCPUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.io.NullWritable;
 import org.apache.hadoop.mapreduce.JobContext;
@@ -216,7 +218,7 @@ public void commitJob(JobContext jobContext) throws IOException {
                       writeDisposition, sourceUris, partitionType, range, partitionByField,
                       requirePartitionFilter, clusteringOrderList, tableExists, getJobIdForImportGCS(conf));
         if (temporaryTableReference != null) {
-          operationAction(destTable, kmsKeyName, getJobIdForUpdateUpsert(conf));
+          operationAction(destTable, kmsKeyName, getJobIdForUpdateUpsert(conf), conf);
         }
       } catch (Exception e) {
         throw new IOException("Failed to import GCS into BigQuery. ", e);
@@ -531,14 +533,16 @@ private static Optional<TableSchema> getTableSchema(Configuration conf) throws I
       return Optional.empty();
     }
 
-    private void operationAction(TableReference tableRef, @Nullable String cmekKey, JobId jobId) throws Exception {
+    private void operationAction(TableReference tableRef, @Nullable String cmekKey, JobId jobId, Configuration config)
+      throws Exception {
       if (allowSchemaRelaxation) {
         updateTableSchema(tableRef);
       }
       String query = generateQuery(tableRef);
       LOG.info("Update/Upsert query: " + query);
 
-      BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();
+      BigQuery bigquery = getBigQuery(config);
+
       QueryJobConfiguration queryConfig =
         QueryJobConfiguration.newBuilder(query)
           .setUseLegacySql(false)
@@ -696,4 +700,20 @@ private RangePartitioning createRangePartitioning(@Nullable String partitionByFi
       return rangePartitioning;
     }
   }
+
+  private static BigQuery getBigQuery(Configuration config) throws IOException {
+    String projectId = ConfigurationUtil.getMandatoryConfig(config, BigQueryConfiguration.PROJECT_ID_KEY);
+    String serviceAccount;
+    boolean isServiceAccountFile = GCPUtils.SERVICE_ACCOUNT_TYPE_FILE_PATH
+      .equals(config.get(GCPUtils.SERVICE_ACCOUNT_TYPE));
+    if (isServiceAccountFile) {
+      serviceAccount = config.get(GCPUtils.CLOUD_JSON_KEYFILE, null);
+    } else {
+      serviceAccount = config.get(String.format("%s.%s", GCPUtils.CLOUD_JSON_KEYFILE_PREFIX,
+                                                GCPUtils.CLOUD_ACCOUNT_JSON_SUFFIX));
+    }
+    Credentials credentials = serviceAccount == null ? null :
+      GCPUtils.loadServiceAccountCredentials(serviceAccount, isServiceAccountFile);
+    return GCPUtils.getBigQuery(projectId, credentials);
+  }
 }