diff --git a/requirements-swh.txt b/requirements-swh.txt
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -1,5 +1,5 @@
 swh.core >= 0.0.95
-swh.indexer >= 0.0.171
+swh.indexer >= 0.3.0
 swh.model >= 0.5.0
 swh.scheduler >= 0.1.1
 swh.search >= 0.2.0
diff --git a/swh/web/common/archive.py b/swh/web/common/archive.py
--- a/swh/web/common/archive.py
+++ b/swh/web/common/archive.py
@@ -182,7 +182,7 @@
     filetype = _first_element(list(idx_storage.content_mimetype_get([sha1])))
     if not filetype:
         return None
-    return converters.from_filetype(filetype)
+    return converters.from_filetype(filetype.to_dict())
 
 
 def lookup_content_language(q):
diff --git a/swh/web/tests/conftest.py b/swh/web/tests/conftest.py
--- a/swh/web/tests/conftest.py
+++ b/swh/web/tests/conftest.py
@@ -330,7 +330,9 @@
         self.mimetype_indexer.run([hash_to_bytes(cnt_id)], "update-dups")
 
     def content_get_mimetype(self, cnt_id):
-        mimetype = next(self.idx_storage.content_mimetype_get([hash_to_bytes(cnt_id)]))
+        mimetype = self.idx_storage.content_mimetype_get([hash_to_bytes(cnt_id)])[
+            0
+        ].to_dict()
         return converters.from_filetype(mimetype)
 
     def content_add_language(self, cnt_id):