diff --git a/11.0/Dockerfile b/11.0/Dockerfile
index e872d7f..767d416 100644
--- a/11.0/Dockerfile
+++ b/11.0/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:stretch
+FROM python:3.5-slim-stretch
 LABEL maintainer="Odoo S.A. <info@odoo.com>"
 
 # Generate locale C.UTF-8 for postgres and general locale data
@@ -54,7 +54,6 @@ RUN set -x; \
         && rm -rf /var/lib/apt/lists/* odoo.deb
 
 # Copy entrypoint script and Odoo configuration file
-RUN pip3 install --upgrade pip
 RUN pip3 install num2words xlwt phonenumbers
 COPY ./entrypoint.sh /
 COPY ./odoo.conf /etc/odoo/
diff --git a/12.0/Dockerfile b/12.0/Dockerfile
index 231dcff..14d3e0c 100644
--- a/12.0/Dockerfile
+++ b/12.0/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:stretch
+FROM python:3.5-slim-stretch
 LABEL maintainer="Odoo S.A. <info@odoo.com>"
 
 # Generate locale C.UTF-8 for postgres and general locale data
@@ -68,7 +68,6 @@ RUN set -x; \
         && rm -rf /var/lib/apt/lists/* odoo.deb
 
 # Copy entrypoint script and Odoo configuration file
-RUN pip3 install --upgrade pip
 RUN pip3 install num2words xlwt phonenumbers
 COPY ./entrypoint.sh /
 COPY ./odoo.conf /etc/odoo/
diff --git a/13.0/Dockerfile b/13.0/Dockerfile
index ed1e4d0..34419a1 100644
--- a/13.0/Dockerfile
+++ b/13.0/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:buster
+FROM python:3.7-slim-buster
 LABEL maintainer="Odoo S.A. <info@odoo.com>"
 
 # Generate locale C.UTF-8 for postgres and general locale data
@@ -59,7 +59,6 @@ RUN set -x; \
         && rm -rf /var/lib/apt/lists/* odoo.deb
 
 # Copy entrypoint script and Odoo configuration file
-RUN pip3 install --upgrade pip
 RUN pip3 install num2words xlwt phonenumbers
 COPY ./entrypoint.sh /
 COPY ./odoo.conf /etc/odoo/