diff --git a/lessons/07-add-docker/Dockerfile b/lessons/07-add-docker/Dockerfile
index 741ea65..c30857e 100644
--- a/lessons/07-add-docker/Dockerfile
+++ b/lessons/07-add-docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8-slim
+FROM python:3.9-slim
 
 # Establish a working folder
 WORKDIR /app