diff --git a/template/python/Dockerfile b/template/python/Dockerfile
index dfdbc25..ed8006c 100644
--- a/template/python/Dockerfile
+++ b/template/python/Dockerfile
@@ -2,14 +2,14 @@ FROM bde2020/spark-submit:3.1.1-hadoop3.2
 
 LABEL maintainer="Gezim Sejdiu <g.sejdiu@gmail.com>, Giannis Mouchakis <gmouchakis@gmail.com>"
 
-# Copy the source code
-COPY . /app
-
 COPY template.sh /
 
 # Copy the requirements.txt first, for separate dependency resolving and downloading
-COPY requirements.txt /app/
-RUN cd /app \
+ONBUILD COPY requirements.txt /app/
+ONBUILD RUN cd /app \
       && pip3 install -r requirements.txt
 
+# Copy the source code
+ONBUILD COPY . /app
+
 CMD ["/bin/bash", "/template.sh"]