diff --git a/Chapter 2/03 - Reducing the size of containers/Dockerfile b/Chapter 2/03 - Reducing the size of containers/Dockerfile
index d8dcce9..5f78ed4 100644
--- a/Chapter 2/03 - Reducing the size of containers/Dockerfile	
+++ b/Chapter 2/03 - Reducing the size of containers/Dockerfile	
@@ -10,4 +10,4 @@ RUN apk add --no-cache py3-pip && \
     apk del py3-pip
 
 COPY echo.py .
-CMD ["python", "echo.py"]
+CMD ["python3", "echo.py"]