diff --git a/preflibapp/management/commands/dataset_as_yml.py b/preflibapp/management/commands/dataset_as_yml.py
index 891fe44..b5b0cc3 100644
--- a/preflibapp/management/commands/dataset_as_yml.py
+++ b/preflibapp/management/commands/dataset_as_yml.py
@@ -28,7 +28,7 @@ def handle(self, *args, **options):
                 "selected_studies": dataset.selected_studies,
                 "publication_date": dataset.publication_date,
                 "modification_date": dataset.modification_date,
-                "tags": [t.name for t in dataset.tags]
+                "tags": [t.name for t in dataset.tags.all()]
             })
 
         if not options["f"]:
diff --git a/requirements.txt b/requirements.txt
index 503b683..2e6cf89 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 Django
 numpy
 preflibtools
-django-distill
\ No newline at end of file
+django-distill
+pyyaml
\ No newline at end of file