diff --git a/Dockerfile b/Dockerfile
index af9296a..fc5f5bd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,15 +1,18 @@
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
+# Copyright 2021 Canonical Ltd.
 #
-#    http://www.apache.org/licenses/LICENSE-2.0
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-# implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+##
 ########################################################################################
 # This Dockerfile is intented for devops testing and deb package generation
 #
@@ -21,7 +24,7 @@
 #   devops-stages/stage-build.sh
 #
 
-FROM ubuntu:22.04
+FROM ubuntu:20.04
 
 ARG APT_PROXY
 RUN if [ ! -z $APT_PROXY ] ; then \
@@ -32,21 +35,22 @@
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get -y install \
         debhelper \
-        dh-python \
+        dh-make \
         git \
         python3 \
         python3-all \
         python3-dev \
-        python3-setuptools \
-        python3-pip \
-        tox
+        python3-setuptools
+
+RUN python3 -m easy_install pip==21.3.1
+RUN pip install tox==3.24.5
 
 ENV LC_ALL C.UTF-8
 ENV LANG C.UTF-8
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get -y install \
-        dh-make
+        unzip
 
 RUN curl https://get.helm.sh/helm-v3.11.3-linux-amd64.tar.gz --output helm-v3.11.3.tar.gz \
     && tar -zxvf helm-v3.11.3.tar.gz \