diff --git a/app.py b/app.py
index 36775d0..16bc39b 100644
--- a/app.py
+++ b/app.py
@@ -10,7 +10,6 @@
 import openai
 from dotenv import load_dotenv
 from openai import OpenAI
-from langchain.vectorstores import Chroma
 
 load_dotenv()
 
@@ -95,12 +94,6 @@
         chroma_client.delete_collection(collection.name)
     except AttributeError:
         st.error("Collection erased.")
-
-if chroma_client.get_collection(collection.name) is not None:
-    langchain_agent = Chroma(client=chroma_client,
-                             collection_name=collection.name,
-                             embedding_function=embedding_function
-                             )
      
 
 
diff --git a/wk_flow_requirements.txt b/wk_flow_requirements.txt
index fd84690..b54a825 100644
--- a/wk_flow_requirements.txt
+++ b/wk_flow_requirements.txt
@@ -2,5 +2,6 @@ streamlit
 pymupdf
 openai
 tiktoken
-pylint
+pylint}
+langchain
 chromadb>='0.4.18'