diff --git a/python/llm/src/ipex_llm/transformers/speculative.py b/python/llm/src/ipex_llm/transformers/speculative.py
index d0c90b10..b7e486ed 100644
--- a/python/llm/src/ipex_llm/transformers/speculative.py
+++ b/python/llm/src/ipex_llm/transformers/speculative.py
@@ -54,7 +54,8 @@ if version.parse(trans_version) >= version.parse("4.39.0"):
     try:
         from trl.core import top_k_top_p_filtering
     except ModuleNotFoundError:
-        log4Error.invalidInputError(False, "For transformers version >= 4.39.0, pip install trl")
+        log4Error.invalidInputError(False,
+                                    "For transformers version >= 4.39.0, pip install trl==0.11.0")
 else:
     from transformers import top_k_top_p_filtering