diff --git a/docker/Dockerfile b/docker/Dockerfile
index 6107dced43..12cff84131 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -27,7 +27,7 @@ ARG PYTHON_VERSION=3.11
###
# We hardcode the use of Debian bullseye here because this could change upstream
# and other Dockerfiles used for testing are expecting bullseye.
-FROM docker.io/python:${PYTHON_VERSION}-slim-bullseye as requirements
+FROM docker.io/library/python:${PYTHON_VERSION}-slim-bullseye as requirements
# RUN --mount is specific to buildkit and is documented at
# https://github.com/moby/buildkit/blob/master/frontend/dockerfile/docs/syntax.md#build-mounts-run---mount.
@@ -87,7 +87,7 @@ RUN if [ -z "$TEST_ONLY_IGNORE_POETRY_LOCKFILE" ]; then \
###
### Stage 1: builder
###
-FROM docker.io/python:${PYTHON_VERSION}-slim-bullseye as builder
+FROM docker.io/library/python:${PYTHON_VERSION}-slim-bullseye as builder
# install the OS build deps
RUN \
@@ -158,7 +158,7 @@ RUN --mount=type=cache,target=/synapse/target,sharing=locked \
### Stage 2: runtime
###
-FROM docker.io/python:${PYTHON_VERSION}-slim-bullseye
+FROM docker.io/library/python:${PYTHON_VERSION}-slim-bullseye
LABEL org.opencontainers.image.url='https://matrix.org/docs/projects/server/synapse'
LABEL org.opencontainers.image.documentation='https://github.com/matrix-org/synapse/blob/master/docker/README.md'
diff --git a/docker/Dockerfile-dhvirtualenv b/docker/Dockerfile-dhvirtualenv
index 2013732422..861129ebc2 100644
--- a/docker/Dockerfile-dhvirtualenv
+++ b/docker/Dockerfile-dhvirtualenv
@@ -24,7 +24,7 @@ ARG distro=""
# https://launchpad.net/~jyrki-pulliainen/+archive/ubuntu/dh-virtualenv, but
# it's not obviously easier to use that than to build our own.)
-FROM ${distro} as builder
+FROM docker.io/library/${distro} as builder
RUN apt-get update -qq -o Acquire::Languages=none
RUN env DEBIAN_FRONTEND=noninteractive apt-get install \
@@ -55,7 +55,7 @@ RUN cd /dh-virtualenv && DEB_BUILD_OPTIONS=nodoc dpkg-buildpackage -us -uc -b
###
### Stage 1
###
-FROM ${distro}
+FROM docker.io/library/${distro}
# Get the distro we want to pull from as a dynamic build variable
# (We need to define it in each build stage)
diff --git a/docker/Dockerfile-workers b/docker/Dockerfile-workers
index faf7f2cef8..adb9a725e3 100644
--- a/docker/Dockerfile-workers
+++ b/docker/Dockerfile-workers
@@ -7,7 +7,7 @@ ARG FROM=matrixdotorg/synapse:$SYNAPSE_VERSION
# target image. For repeated rebuilds, this is much faster than apt installing
# each time.
-FROM debian:bullseye-slim AS deps_base
+FROM docker.io/library/debian:bullseye-slim AS deps_base
RUN \
--mount=type=cache,target=/var/cache/apt,sharing=locked \
--mount=type=cache,target=/var/lib/apt,sharing=locked \
@@ -21,7 +21,7 @@ FROM debian:bullseye-slim AS deps_base
# which makes it much easier to copy (but we need to make sure we use an image
# based on the same debian version as the synapse image, to make sure we get
# the expected version of libc.
-FROM redis:6-bullseye AS redis_base
+FROM docker.io/library/redis:6-bullseye AS redis_base
# now build the final image, based on the the regular Synapse docker image
FROM $FROM
diff --git a/docker/complement/Dockerfile b/docker/complement/Dockerfile
index be1aa1c55e..5103068a49 100644
--- a/docker/complement/Dockerfile
+++ b/docker/complement/Dockerfile
@@ -7,6 +7,7 @@
# https://github.com/matrix-org/synapse/blob/develop/docker/README-testing.md#testing-with-postgresql-and-single-or-multi-process-synapse
ARG SYNAPSE_VERSION=latest
+# This is an intermediate image, to be built locally (not pulled from a registry).
ARG FROM=matrixdotorg/synapse-workers:$SYNAPSE_VERSION
FROM $FROM
@@ -19,8 +20,8 @@ FROM $FROM
# the same debian version as Synapse's docker image (so the versions of the
# shared libraries match).
RUN adduser --system --uid 999 postgres --home /var/lib/postgresql
- COPY --from=postgres:13-bullseye /usr/lib/postgresql /usr/lib/postgresql
- COPY --from=postgres:13-bullseye /usr/share/postgresql /usr/share/postgresql
+ COPY --from=docker.io/library/postgres:13-bullseye /usr/lib/postgresql /usr/lib/postgresql
+ COPY --from=docker.io/library/postgres:13-bullseye /usr/share/postgresql /usr/share/postgresql
RUN mkdir /var/run/postgresql && chown postgres /var/run/postgresql
ENV PATH="${PATH}:/usr/lib/postgresql/13/bin"
ENV PGDATA=/var/lib/postgresql/data
diff --git a/docker/editable.Dockerfile b/docker/editable.Dockerfile
index 0e8cf2e712..c53ce1c718 100644
--- a/docker/editable.Dockerfile
+++ b/docker/editable.Dockerfile
@@ -10,7 +10,7 @@ ARG PYTHON_VERSION=3.9
###
# We hardcode the use of Debian bullseye here because this could change upstream
# and other Dockerfiles used for testing are expecting bullseye.
-FROM docker.io/python:${PYTHON_VERSION}-slim-bullseye
+FROM docker.io/library/python:${PYTHON_VERSION}-slim-bullseye
# Install Rust and other dependencies (stolen from normal Dockerfile)
# install the OS build deps
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