diff --git a/Dockerfile b/Dockerfile
index 93a7e20..d15a66c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,5 +9,6 @@ RUN uv pip install -r requirements.txt
 COPY . .
 
 ENV GRADIO_SERVER_NAME="0.0.0.0"
+ENV GRADIO_SERVER_PORT="8080"
 
 CMD .venv/bin/python main.py
diff --git a/docker-compose.yml b/docker-compose.yml
index 15e78a7..ccabeb5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -2,7 +2,7 @@ services:
   web:
     build: .
     ports:
-      - "8080:7860"
+      - "8080:8080"
     environment:
       GEMINI_API_KEY: ${GEMINI_API_KEY}
     
diff --git a/main.py b/main.py
index b2d875d..fb0c626 100644
--- a/main.py
+++ b/main.py
@@ -65,6 +65,9 @@ def get_mp3(text: str, voice: str, api_key: str = None) -> bytes:
 
 def generate_audio(file: bytes, openai_api_key: str) -> bytes:
 
+    if not os.getenv("OPENAI_API_KEY", openai_api_key):
+        raise gr.Error("OpenAI API key is required")
+
     reader = PdfReader(io.BytesIO(file))
     text = "\n\n".join([page.extract_text() for page in reader.pages])