diff --git a/vllm/transformers_utils/config.py b/vllm/transformers_utils/config.py
index 32241aec53e..bb6ad1056b7 100644
--- a/vllm/transformers_utils/config.py
+++ b/vllm/transformers_utils/config.py
@@ -66,6 +66,13 @@ MISTRAL_CONFIG_NAME = "params.json"
 
 logger = init_logger(__name__)
 
+if Version(version("transformers")) < Version("5.0.0"):
+    logger.warning(
+        "Support for Transformers v4 is deprecated. The Transformers v4 codepath will "
+        "become unmaintained in vLLM v0.22.0 and will be removed in vLLM v0.24.0. "
+        "Please upgrade to Transformers v5: pip install --upgrade transformers"
+    )
+
 
 class LazyConfigDict(dict):
     def __getitem__(self, key):