diff --git a/Dockerfile b/Dockerfile
index 3ad79b7..e248e59 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM lsiobase/alpine.python:3.8
+FROM lsiobase/alpine.python:3.9
 
 # set version label
 ARG BUILD_DATE
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index ad95379..f3b3e61 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -1,4 +1,4 @@
-FROM lsiobase/alpine.python.arm64:3.8
+FROM lsiobase/alpine.python.arm64:3.9
 
 # Add qemu to build on x86_64 systems
 COPY qemu-aarch64-static /usr/bin
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index 964dc85..5ff5dbc 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -1,4 +1,4 @@
-FROM lsiobase/alpine.python.armhf:3.8
+FROM lsiobase/alpine.python.armhf:3.9
 
 # Add qemu to build on x86_64 systems
 COPY qemu-arm-static /usr/bin
diff --git a/readme-vars.yml b/readme-vars.yml
index 45d236c..5327102 100644
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -44,4 +44,5 @@ app_setup_block: |
 
 # changelog
 changelogs:
+  - { date: "22.02.19:", desc: "Rebasing to alpine 3.9." }
   - { date: "11.09.18:", desc: "Initial release." }