diff --git a/open/gcube-4.21.0.yaml b/open/gcube-4.21.0.yaml
index df284bb..ed3763c 100644
--- a/open/gcube-4.21.0.yaml
+++ b/open/gcube-4.21.0.yaml
@@ -86,6 +86,8 @@ gCube_release:
         version: 6.23.1  
       - name: news-feed
         version: 2.8.3  
+      - name: social-mail-servlet
+        version: 2.4.0  
      
     Distribution:
       - name: gcube-portal-bundle