diff --git a/images/Dockerfile b/images/Dockerfile
index 86d2136..d87ec46 100644
--- a/images/Dockerfile
+++ b/images/Dockerfile
@@ -1,130 +1,130 @@
 ARG debianversion=buster
 FROM debian:${debianversion:-buster} as swh-common
 LABEL maintainer="Software Heritage <sysop@softwareheritage.org>"
 ENV PROJECT_NAME swh-base
 
 RUN export DEBIAN_FRONTEND=noninteractive && \
   apt-get update && apt-get upgrade -y && \
   apt-get install -y \
     apt-transport-https \
     curl \
     lsb-release \
     wait-for-it
 
 
 RUN echo deb http://deb.debian.org/debian/ $(lsb_release -sc)-backports main \
          > /etc/apt/sources.list.d/backports.list
 
 RUN echo deb [trusted=yes] https://debian.softwareheritage.org/ $(lsb_release -sc)-swh main  \
          > /etc/apt/sources.list.d/softwareheritage.list
 
 RUN mkdir /etc/softwareheritage
 RUN mkdir -p /var/run/gunicorn/swh
 RUN mkdir -p /var/lib/swh
 RUN mkdir -p /srv/softwareheritage
 
 ENV SWH_CONFIG_FILENAME=/etc/softwareheritage/config.yml
 ENV LC_ALL=C.UTF-8
 
 ##################################
 # BASE services
 ##################################
 
 FROM swh-common as swh-base
 ARG SWH_VER
 ENV SWH_VER=${SWH_VER}
 
 RUN export DEBIAN_FRONTEND=noninteractive && \
   apt-get update && \
   apt-get install -y \
     --no-install-recommends \
 	# git is required for the vault-worker... maybe use a dedicated image gor this
 	git \
-    gunicorn \
+    gunicorn/$(lsb_release -sc)-backports \
     postgresql-client \
     python3-typing-extensions/$(lsb_release -sc)-backports \
     python3-dulwich \
     python3-swh.indexer \
     python3-swh.indexer.storage \
     python3-swh.journal \
     python3-swh.objstorage \
     python3-swh.objstorage.cloud \
 #    python3-swh.objstorage.rados \
     python3-swh.scheduler \
     python3-swh.search \
     python3-swh.storage \
     python3-swh.vault \
     zstd \
     && \
   apt-get clean && \
   rm -rf /var/lib/apt/lists/*
 ## still missing: vault, deposit
 
 COPY conf/logconfig.ini /etc/gunicorn/logconfig.ini
 COPY conf/gunicorn.cfg /etc/gunicorn/swh.cfg
 COPY tools/*.sh /srv/softwareheritage/utils/
 COPY tools/*.sql /srv/softwareheritage/utils/
 COPY tools/*.py /srv/softwareheritage/utils/
 RUN chmod +x /srv/softwareheritage/utils/*.sh
 
 COPY base/entrypoint.sh /
 ENTRYPOINT ["/entrypoint.sh"]
 
 ##################################
 # WEB
 ##################################
 FROM swh-common as swh-web
 ARG SWH_VER
 ENV SWH_VER=${SWH_VER}
 
 ENV DJANGO_SETTINGS_MODULE=swh.web.settings.production
 
 RUN export DEBIAN_FRONTEND=noninteractive && \
   apt-get update && \
   apt-get install -y --no-install-recommends \
-    gunicorn \
+    gunicorn/$(lsb_release -sc)-backports \
     postgresql-client \
     python3-typing-extensions/$(lsb_release -sc)-backports \
     python3-django/$(lsb_release -sc)-backports \
     python3-magic \
     python3-swh.web \
     && \
   apt-get clean && \
   rm -rf /var/lib/apt/lists/*
 
 COPY conf/logconfig.ini /etc/gunicorn/logconfig.ini
 COPY conf/gunicorn.cfg /etc/gunicorn/swh.cfg
 COPY tools/*.sh /srv/softwareheritage/utils/
 COPY tools/*.sql /srv/softwareheritage/utils/
 RUN chmod +x /srv/softwareheritage/utils/*.sh
 
 COPY web/entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]
 
 ##################################
 # Mirror (replayer)
 ##################################
 FROM swh-common as swh-replayer
 ARG SWH_VER
 ENV SWH_VER=${SWH_VER}
 
 RUN export DEBIAN_FRONTEND=noninteractive && \
   apt-get update && \
   apt-get install -y \
     --no-install-recommends \
-    gunicorn \
+    gunicorn/$(lsb_release -sc)-backports \
     python3-typing-extensions/$(lsb_release -sc)-backports \
     python3-swh.journal \
     python3-swh.objstorage \
     python3-swh.objstorage.replayer \
     python3-swh.storage \
     && \
   apt-get clean && \
   rm -rf /var/lib/apt/lists/*
 
 COPY tools/*.sh /srv/softwareheritage/utils/
 COPY tools/*.sql /srv/softwareheritage/utils/
 RUN chmod +x /srv/softwareheritage/utils/*.sh
 
 COPY replayer/entrypoint.sh /
 ENTRYPOINT ["/entrypoint.sh"]