Update README.md

README.md

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 <!-- Provide a quick summary of what the model is/does. -->
 
+**For transformers versions v4.40.0 or newer, please use [OLMo 7B HF](https://huggingface.co/allenai/OLMo-7B-hf) instead.**
+
 OLMo is a series of **O**pen **L**anguage **Mo**dels designed to enable the science of language models.
 The OLMo models are trained on the [Dolma](https://huggingface.co/datasets/allenai/dolma) dataset.
 We release all code, checkpoints, logs (coming soon), and details involved in training these models.