diff --git a/Dockerfile b/Dockerfile
index dfe2249..45639b5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,12 @@
-FROM alpine:3.20.3
+FROM alpine:3.23.2
 
 LABEL maintainer="Michael Oberdorf IT-Consulting <info@oberdorf-itc.de>"
-LABEL site.local.program.version="1.4.0"
+LABEL site.local.program.version="1.4.1"
 
 RUN apk upgrade --available --no-cache --update \
     && apk add --no-cache --update \
-       python3=3.12.7-r0 \
-       py3-pip=24.0-r2 \
+       python3=3.12.12-r0 \
+       py3-pip=25.1.1-r1 \
     # Cleanup APK
     && rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
 
diff --git a/Dockerfile.test b/Dockerfile.test
index 98332e2..aad3c08 100644
--- a/Dockerfile.test
+++ b/Dockerfile.test
@@ -1,12 +1,12 @@
-FROM alpine:3.20.3
+FROM alpine:3.23.2
 
 LABEL maintainer="Michael Oberdorf IT-Consulting <info@oberdorf-itc.de>"
-LABEL site.local.program.version="1.4.0"
+LABEL site.local.program.version="1.4.1"
 
 RUN apk upgrade --available --no-cache --update \
     && apk add --no-cache --update \
-       python3=3.12.7-r0 \
-       py3-pip=24.0-r2 \
+       python3=3.12.12-r0 \
+       py3-pip=25.1.1-r1 \
     # Cleanup APK
     && rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
 
diff --git a/src/app/modbus_server.py b/src/app/modbus_server.py
index 693c2f0..b02a37a 100644
--- a/src/app/modbus_server.py
+++ b/src/app/modbus_server.py
@@ -4,7 +4,7 @@
 Author: Michael Oberdorf IT-Consulting
 Datum: 2020-03-30
 Last modified by: Michael Oberdorf
-Last modified at: 2024-10-22
+Last modified at: 2025-12-28
 *************************************************************************** """
 import argparse
 import json
@@ -25,7 +25,7 @@
 
 # default configuration file path
 default_config_file = "/app/modbus_server.json"
-VERSION = "1.4.0"
+VERSION = "1.4.1"
 
 log = logging.getLogger()