diff --git a/doccano_mini/app.py b/doccano_mini/app.py
index 299e947..6750970 100644
--- a/doccano_mini/app.py
+++ b/doccano_mini/app.py
@@ -1,3 +1,5 @@
+import os
+
 import streamlit as st
 from langchain.chains import LLMChain
 from langchain.llms import OpenAI
@@ -47,6 +49,7 @@ def task_classification(task: TaskType):
         prompt.prefix = instruction
 
     st.header("Test")
+    api_key = st.text_input("Enter API key", value=os.environ.get("OPENAI_API_KEY", ""))
     col1, col2 = st.columns([3, 1])
     text = col1.text_area(label="Please enter your text.", value="", height=300)
 
@@ -59,7 +62,7 @@ def task_classification(task: TaskType):
         st.markdown(f"```\n{prompt.format(input=text)}\n```")
 
     if st.button("Predict"):
-        llm = OpenAI(model_name=model_name, temperature=temperature, top_p=top_p)  # type:ignore
+        llm = OpenAI(model_name=model_name, temperature=temperature, top_p=top_p, openai_api_key=api_key)  # type:ignore
         chain = LLMChain(llm=llm, prompt=prompt)
         response = chain.run(text)
         label = response.split(":")[1]