diff --git a/examples/research_projects/rag/requirements.txt b/examples/research_projects/rag/requirements.txt
index fdeb5567d24..5988d38de9e 100644
--- a/examples/research_projects/rag/requirements.txt
+++ b/examples/research_projects/rag/requirements.txt
@@ -3,6 +3,6 @@ datasets >= 1.0.1
 psutil >= 5.7.0
 torch >= 1.4.0
 ray >= 1.10.0
-pytorch-lightning >= 1.5.10
+pytorch-lightning >= 1.5.10, <=1.6.0
 transformers
 GitPython
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