diff --git a/examples/langchain-python-rag-privategpt/requirements.txt b/examples/langchain-python-rag-privategpt/requirements.txt
index 0aad1fe5599..09f2086f17b 100644
--- a/examples/langchain-python-rag-privategpt/requirements.txt
+++ b/examples/langchain-python-rag-privategpt/requirements.txt
@@ -12,4 +12,5 @@ pandoc==2.3
 pypandoc==1.11
 tqdm==4.66.1
 sentence_transformers==2.2.2
-numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
+nltk>=3.8.2 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file