diff --git a/dhp-schemas/pom.xml b/dhp-schemas/pom.xml
index 491cbe668..ec5af8d3c 100644
--- a/dhp-schemas/pom.xml
+++ b/dhp-schemas/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>eu.dnetlib.dhp</groupId>
         <artifactId>dhp</artifactId>
-        <version>1.0.5-SNAPSHOT</version>
+        <version>1.1.5-SNAPSHOT</version>
         <relativePath>../</relativePath>
     </parent>
 
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Instance.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Instance.java
index f27704c5c..8726b85ce 100644
--- a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Instance.java
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/oaf/Instance.java
@@ -1,6 +1,7 @@
 package eu.dnetlib.dhp.schema.oaf;
 
 import java.io.Serializable;
+import java.util.List;
 
 public class Instance implements Serializable {
 
@@ -12,7 +13,7 @@ public class Instance implements Serializable {
 
     private KeyValue hostedby;
 
-    private String url;
+    private List<String> url;
 
     // other research products specifc
     private  String distributionlocation;
@@ -53,11 +54,11 @@ public class Instance implements Serializable {
         this.hostedby = hostedby;
     }
 
-    public String getUrl() {
+    public List<String> getUrl() {
         return url;
     }
 
-    public void setUrl(String url) {
+    public void setUrl(List<String> url) {
         this.url = url;
     }