diff --git a/Dockerfile b/Dockerfile
index 932cdd4..2ac2e12 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,5 +11,4 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy application code
 COPY app/ .
 
-# Start command using shell to allow env substitution
-CMD sh -c "exec python app.py --port=\${PORT}"
+CMD ["python", "app.py"]
diff --git a/main.py b/main.py
index e5bf450..72ec938 100755
--- a/main.py
+++ b/main.py
@@ -125,7 +125,7 @@ def run_prod(args):
     """
     command = [
         "docker", "run", "-d",
-        "-p", "{PORT}:{PORT}",
+        "-p", "{PORT}:5000",
         "--name", "portfolio",
         "application-portfolio"
     ]