diff --git a/paperqa/docs.py b/paperqa/docs.py
index 921cde0e..a3e8204e 100644
--- a/paperqa/docs.py
+++ b/paperqa/docs.py
@@ -171,11 +171,12 @@ def add_texts(
             for metadata in metadatas:
                 metadata["dockey"] = new_key
                 metadata["key"] = metadata["key"].replace(key, new_key)
+            key = new_key
         if text_embeddings is None:
             text_embeddings = self.embeddings.embed_documents(texts)
         if self._faiss_index is not None:
             self._faiss_index.add_embeddings(
-                zip(texts, text_embeddings), metadatas=metadatas
+                list(zip(texts, text_embeddings)), metadatas=metadatas
             )
         elif self._doc_index is not None:
             self._doc_index.add_texts([citation], metadatas=[{"key": key}])
diff --git a/paperqa/version.py b/paperqa/version.py
index e4adfb83..f49459c7 100644
--- a/paperqa/version.py
+++ b/paperqa/version.py
@@ -1 +1 @@
-__version__ = "1.6.0"
+__version__ = "1.6.1"