diff --git a/.drone.yml b/.drone.yml
index 9b1073a..48a343a 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -15,7 +15,7 @@ trigger:
 
 steps:
   - name: install-lint-test
-    image: python:3.8.19-alpine@sha256:c2f31d16113f2c1152934d321855c9f0169143dff96d716dada19e0047d6ddee
+    image: python:3.9.20-alpine@sha256:97b255a01c06e7964a57b1c3c67124c99db48de6ba529ef56b1500e4527f5f3c
     env:
       PYROOT: '/pyroot'
       PYTHONUSERBASE: '/pyroot'
@@ -103,7 +103,7 @@ trigger:
 
 steps:
   - name: install-lint-test
-    image: python:3.8.19-alpine@sha256:c2f31d16113f2c1152934d321855c9f0169143dff96d716dada19e0047d6ddee
+    image: python:3.9.20-alpine@sha256:97b255a01c06e7964a57b1c3c67124c99db48de6ba529ef56b1500e4527f5f3c
     env:
       PYROOT: '/pyroot'
       PYTHONUSERBASE: '/pyroot'
diff --git a/.python-version b/.python-version
index 143c2f5..9432908 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.8.19
+3.9.20
diff --git a/Dockerfile b/Dockerfile
index b2e0355..abc1aba 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-FROM python:3.8.19-alpine@sha256:c2f31d16113f2c1152934d321855c9f0169143dff96d716dada19e0047d6ddee AS builder
+FROM python:3.9.20-alpine@sha256:97b255a01c06e7964a57b1c3c67124c99db48de6ba529ef56b1500e4527f5f3c AS builder
 
 ENV PYROOT=/pyroot
 ENV PYTHONUSERBASE=$PYROOT
@@ -20,7 +20,7 @@ RUN PIP_USER=1 PIP_IGNORE_INSTALLED=1 pipenv install --system --deploy --ignore-
 RUN pip3 uninstall --yes pipenv
 
 
-FROM python:3.8.19-alpine@sha256:c2f31d16113f2c1152934d321855c9f0169143dff96d716dada19e0047d6ddee AS ki-backend
+FROM python:3.9.20-alpine@sha256:97b255a01c06e7964a57b1c3c67124c99db48de6ba529ef56b1500e4527f5f3c AS ki-backend
 
 ENV PYROOT=/pyroot
 ENV PYTHONUSERBASE=$PYROOT