diff --git a/Kitodo/src/main/java/org/kitodo/production/helper/SearchResultGeneration.java b/Kitodo/src/main/java/org/kitodo/production/helper/SearchResultGeneration.java
index 34a9acd64ef..682b637dc43 100644
--- a/Kitodo/src/main/java/org/kitodo/production/helper/SearchResultGeneration.java
+++ b/Kitodo/src/main/java/org/kitodo/production/helper/SearchResultGeneration.java
@@ -16,9 +16,9 @@
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.apache.poi.hssf.usermodel.HSSFRow;
-import org.apache.poi.hssf.usermodel.HSSFSheet;
-import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.elasticsearch.index.query.BoolQueryBuilder;
 import org.elasticsearch.index.query.RangeQueryBuilder;
 import org.elasticsearch.search.sort.SortOrder;
@@ -56,7 +56,7 @@ public SearchResultGeneration(String filter, boolean showClosedProcesses, boolea
      *
      * @return HSSFWorkbook
      */
-    public HSSFWorkbook getResult() {
+    public XSSFWorkbook getResult() {
         return getWorkbook();
     }
 
@@ -96,11 +96,11 @@ public BoolQueryBuilder getQueryForFilter(ObjectType objectType) {
         return query;
     }
 
-    private HSSFWorkbook getWorkbook() {
-        HSSFWorkbook workbook = new HSSFWorkbook();
-        HSSFSheet sheet = workbook.createSheet("Search results");
+    private XSSFWorkbook getWorkbook() {
+        XSSFWorkbook workbook = new XSSFWorkbook();
+        Sheet sheet = workbook.createSheet("Search results");
 
-        HSSFRow title = sheet.createRow(0);
+        Row title = sheet.createRow(0);
         title.createCell(0).setCellValue(this.filter);
         for (int i = 1; i < 8; i++) {
             title.createCell(i).setCellValue("");
@@ -113,7 +113,7 @@ private HSSFWorkbook getWorkbook() {
         return workbook;
     }
 
-    private void insertRowData(HSSFSheet sheet) {
+    private void insertRowData(Sheet sheet) {
         int rowCounter = 2;
         long numberOfProcessedProcesses = 0;
         int elasticsearchLimit = 9999;
@@ -149,8 +149,8 @@ private void insertRowData(HSSFSheet sheet) {
         }
     }
 
-    private void setRowHeader(HSSFSheet sheet) {
-        HSSFRow rowHeader = sheet.createRow(1);
+    private void setRowHeader(Sheet sheet) {
+        Row rowHeader = sheet.createRow(1);
         rowHeader.createCell(0).setCellValue(Helper.getTranslation("title"));
         rowHeader.createCell(1).setCellValue(Helper.getTranslation("ID"));
         rowHeader.createCell(2).setCellValue(Helper.getTranslation("Datum"));
@@ -161,8 +161,8 @@ private void setRowHeader(HSSFSheet sheet) {
         rowHeader.createCell(7).setCellValue(Helper.getTranslation("Status"));
     }
 
-    private void prepareRow(int rowCounter, HSSFSheet sheet, ProcessDTO processDTO) {
-        HSSFRow row = sheet.createRow(rowCounter);
+    private void prepareRow(int rowCounter, Sheet sheet, ProcessDTO processDTO) {
+        Row row = sheet.createRow(rowCounter);
         row.createCell(0).setCellValue(processDTO.getTitle());
         row.createCell(1).setCellValue(processDTO.getId());
         row.createCell(2).setCellValue(processDTO.getCreationDate());
diff --git a/Kitodo/src/main/java/org/kitodo/production/services/data/ProcessService.java b/Kitodo/src/main/java/org/kitodo/production/services/data/ProcessService.java
index b813448d4cb..40af18e8a06 100644
--- a/Kitodo/src/main/java/org/kitodo/production/services/data/ProcessService.java
+++ b/Kitodo/src/main/java/org/kitodo/production/services/data/ProcessService.java
@@ -79,8 +79,8 @@
 import org.apache.lucene.search.join.ScoreMode;
 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFRow;
-import org.apache.poi.hssf.usermodel.HSSFSheet;
-import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.DataFormatter;
 import org.apache.poi.ss.usermodel.Row;
@@ -1554,9 +1554,9 @@ public void generateResultAsPdf(String filter, boolean showClosedProcesses, bool
             try (OutputStream out = response.getResponseOutputStream()) {
                 SearchResultGeneration sr = new SearchResultGeneration(filter, showClosedProcesses,
                         showInactiveProjects);
-                HSSFWorkbook wb = sr.getResult();
+                XSSFWorkbook wb = sr.getResult();
                 List<List<HSSFCell>> rowList = new ArrayList<>();
-                HSSFSheet mySheet = wb.getSheetAt(0);
+                Sheet mySheet = wb.getSheetAt(0);
                 Iterator<Row> rowIter = mySheet.rowIterator();
                 while (rowIter.hasNext()) {
                     HSSFRow myRow = (HSSFRow) rowIter.next();
@@ -1596,11 +1596,11 @@ public void generateResult(String filter, boolean showClosedProcesses, boolean s
             throws IOException {
         FacesContext facesContext = FacesContext.getCurrentInstance();
         if (!facesContext.getResponseComplete()) {
-            ExternalContext response = prepareHeaderInformation(facesContext, "search.xls");
+            ExternalContext response = prepareHeaderInformation(facesContext, "search.xlsx");
             try (OutputStream out = response.getResponseOutputStream()) {
                 SearchResultGeneration sr = new SearchResultGeneration(filter, showClosedProcesses,
                         showInactiveProjects);
-                HSSFWorkbook wb = sr.getResult();
+                XSSFWorkbook wb = sr.getResult();
                 wb.write(out);
                 out.flush();
                 facesContext.responseComplete();