diff --git a/OCI/Dockerfile b/OCI/Dockerfile
index 32536ef..6d37766 100644
--- a/OCI/Dockerfile
+++ b/OCI/Dockerfile
@@ -1,4 +1,4 @@
-ARG PARENT_IMAGE=alpine:3.16
+ARG PARENT_IMAGE=alpine:3.21
 FROM ${PARENT_IMAGE}
 LABEL maintainer="Dominik Chilla <dominik@zwackl.de>"
 LABEL git_repo="https://github.com/chillout2k/exota-milter"
@@ -8,7 +8,7 @@ ADD ./requirements.txt /requirements.txt
 RUN apk update \
   && apk add --no-cache python3 python3-dev py3-pip \
       gcc libc-dev libmilter-dev \
-  && pip3 install -r requirements.txt \
+  && pip3 install -r requirements.txt --break-system-packages \
   && apk del gcc libc-dev libmilter-dev python3-dev py3-pip \
   && apk add libmilter \
   && adduser -D exota-milter \