diff --git a/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java b/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java
index 069b429..fc158af 100644
--- a/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java
+++ b/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java
@@ -118,7 +118,7 @@ public class RepositoryServiceImpl implements RepositoryService {
         LOGGER.debug("Updated version!");
 
         httpHeaders = new HttpHeaders();
-        httpHeaders.set("Content-Type", "application/json");
+        httpHeaders.setContentType(MediaType.APPLICATION_JSON_UTF8);
 
         for (String vocName : vocabularyNames) {
             vocabularyMap.put(vocName, vocabularyLoader.getVocabulary(vocName, Locale.ENGLISH, Locale.ROOT));