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Any property of records in a collection can be updated with .update: 
collection.update(
    ids=["id1", "id2", "id3", ...],
    embeddings=[[1.1, 2.3, 3.2], [4.5, 6.9, 4.4], [1.1, 2.3, 3.2], ...],
    metadatas=[{"chapter": 3, "verse": 16}, {"chapter": 3, "verse": 5}, {"chapter": 29, "verse": 11}, ...],
    documents=["doc1", "doc2", "doc3", ...],
)
If an id is not found in the collection, an error will be logged and the update will be ignored. If documents are supplied without corresponding embeddings, the embeddings will be recomputed with the collection’s embedding function. If the supplied embeddings are not the same dimension as the collection, an exception will be raised. Chroma also supports an upsert operation, which updates existing items, or adds them if they don’t yet exist. 
collection.upsert(
    ids=["id1", "id2", "id3", ...],
    embeddings=[[1.1, 2.3, 3.2], [4.5, 6.9, 4.4], [1.1, 2.3, 3.2], ...],
    metadatas=[{"chapter": 3, "verse": 16}, {"chapter": 3, "verse": 5}, {"chapter": 29, "verse": 11}, ...],
    documents=["doc1", "doc2", "doc3", ...],
)
If an id is not present in the collection, the corresponding items will be created as per add. Items with existing ids will be updated as per update.