diff --git a/idhub/models.py b/idhub/models.py
index 8e3785e..dd57062 100644
--- a/idhub/models.py
+++ b/idhub/models.py
@@ -563,6 +563,18 @@ class VerificableCredential(models.Model):
 
         return ''
 
+    def filter_dict(self, dic):
+        new_dict = {}
+        for key, value in dic.items():
+            if isinstance(value, dict):
+                new_value = self.filter_dict(value)
+                if new_value:
+                    new_dict[key] = new_value
+            elif value:
+                new_dict[key] = value
+        return new_dict
+
+
 class VCTemplate(models.Model):
     wkit_template_id = models.CharField(max_length=250)
     data = models.TextField()
diff --git a/requirements.txt b/requirements.txt
index a065a87..4aa9c3e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,10 +6,13 @@ black==23.9.1
 python-decouple==3.8
 jsonschema==4.19.1
 pandas==2.1.1
+xlrd==2.0.1
+odfpy==1.4.1
 requests==2.31.0
-#didkit==0.3.2
+didkit==0.3.2
 jinja2==3.1.2
 jsonref==1.1.0
 pyld==2.0.3
 more-itertools==10.1.0
 dj-database-url==2.1.0
+ujson==5.9.0