diff --git a/examples/pytorch/nlp/huggingface_models/common/examples/research_projects/pplm/requirements.txt b/examples/pytorch/nlp/huggingface_models/common/examples/research_projects/pplm/requirements.txt
index 62092cc300a..d20ade4d00a 100644
--- a/examples/pytorch/nlp/huggingface_models/common/examples/research_projects/pplm/requirements.txt
+++ b/examples/pytorch/nlp/huggingface_models/common/examples/research_projects/pplm/requirements.txt
@@ -5,7 +5,7 @@ psutil
 sacrebleu
 rouge-score
 tensorflow_datasets
-pytorch-lightning==1.0.4
+pytorch-lightning==1.6.0
 matplotlib
 git-python==1.0.3
 faiss-cpu