Update requirements.txt

requirements.txt

@@ -1,7 +1,8 @@
 streamlit==1.38.0
 pandas==2.2.3
 openai  # Don't specify a specific version to avoid conflicts
-langchain-openai>=0.1.7,<0.2.0  # Compatible range for OpenAI and langchain-core
-langchain_community>=0.0.7,<0.1.0  # Compatible with langchain-core
+langchain>=0.0.170  # Add the langchain core package
+langchain-openai>=0.1.7,<0.2.0  # Ensure compatibility with langchain-core
+langchain_community>=0.0.7,<0.1.0  # For community extensions
 sqlparse==0.4.4  # SQL parsing and validation
-faiss-cpu>=1.7.3  # For FAISS vector store
+faiss-cpu>=1.7.3  # For FAISS vector store