Update requirements.txt

requirements.txt

@@ -1,11 +1,22 @@
-streamlit
-langchain
-langchain-community
-langchain-groq
-faiss-cpu
-sentence-transformers
-python-dotenv
-pypdf
-docx2txt
-pandas
-reportlab
+streamlit>=1.32.0
+
+# LangChain core (modular)
+langchain==0.1.20
+langchain-core==0.1.52
+langchain-community==0.0.38
+langchain-groq==0.1.4
+
+# Embeddings & Vector DB
+sentence-transformers==2.7.0
+faiss-cpu==1.7.4
+
+# File parsing
+pypdf==4.2.0
+docx2txt==0.8
+pandas==2.2.2
+
+# PDF generation
+reportlab==4.2.0
+
+# Env handling (HF secrets compatible)
+python-dotenv==1.0.1