docs: fix VLLM installation guidelines

README.md

@@ -65,7 +65,12 @@ Make sure to install the latest version of `transformers` or `vllm`, eventually
 pip install git+https://github.com/huggingface/transformers.git
 ```
 
-Refer to [the official vLLM documentation for more details on building vLLM from source](https://docs.vllm.ai/en/latest/getting_started/installation/gpu.html#build-wheel-from-source).
+For vLLM, make sure to install `vllm>=0.9.0`:
+
+```bash
+pip install "vllm>=0.9.0"
+```
+
 
 ### 🤗 transformers