diff --git a/docs/Explore Algorithms/OpenAI/Langchain.ipynb b/docs/Explore Algorithms/OpenAI/Langchain.ipynb
index 620ab74852..005172476b 100644
--- a/docs/Explore Algorithms/OpenAI/Langchain.ipynb	
+++ b/docs/Explore Algorithms/OpenAI/Langchain.ipynb	
@@ -88,7 +88,7 @@
    },
    "outputs": [],
    "source": [
-    "%pip install openai==0.28.1 langchain==0.0.331 pdf2image pdfminer.six unstructured==0.10.24 pytesseract numpy==1.22.4"
+    "%pip install openai==0.28.1 langchain==0.0.331 pdf2image pdfminer.six unstructured==0.10.24 pytesseract numpy==1.22.4 nltk==3.8.1"
    ]
   },
   {