diff --git a/Dockerfile b/Dockerfile
index 8c9d83d62..d1f2c1069 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,78 +1,71 @@
-###########################################
-# Build PyMuPDF
-
-FROM alpine:latest as pymupdf-build
-ARG ARCH
-ARG REQUIREMENTS_TXT
-
-# Install PyMuPDF via hash-checked requirements file
-COPY ${REQUIREMENTS_TXT} /tmp/requirements.txt
-
-# PyMuPDF provides non-arm musl wheels only.
-# Only install build-dependencies if we are actually building the wheel
-RUN case "$ARCH" in \
-    "arm64") \
-        # This is required for copying later, but is created only in the pre-built wheels
-        mkdir -p /usr/lib/python3.12/site-packages/PyMuPDF.libs/ \
-        && apk --no-cache add linux-headers g++ linux-headers gcc make python3-dev py3-pip clang-dev ;; \
-    *) \
-        apk --no-cache add py3-pip ;; \
-    esac
-RUN pip install -vv --break-system-packages --require-hashes -r /tmp/requirements.txt
-
-
-###########################################
-# Download H2ORestart
-FROM alpine:latest as h2orestart-dl
-ARG H2ORESTART_CHECKSUM=d09bc5c93fe2483a7e4a57985d2a8d0e4efae2efb04375fe4b59a68afd7241e2
+# NOTE: Updating the packages to their latest versions requires bumping the
+# Dockerfile args below. For more info about this file, read
+# docs/developer/reproducibility.md.
+
+ARG DEBIAN_IMAGE_DATE=20250113
+
+FROM debian:bookworm-${DEBIAN_IMAGE_DATE}-slim
+
+ARG GVISOR_ARCHIVE_DATE=20250106
+ARG DEBIAN_ARCHIVE_DATE=20250114
+ARG H2ORESTART_CHECKSUM=8a5be77359695c14faaf33891d3eca6c9d73c1224599aab50a9d2ccc04640580
+ARG H2ORESTART_VERSION=v0.6.8
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# The following way of installing packages is taken from
+# https://github.com/reproducible-containers/repro-sources-list.sh/blob/master/Dockerfile.debian-12,
+# and adapted to allow installing gVisor from each own repo as well.
+RUN \
+  --mount=type=cache,target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,target=/var/lib/apt,sharing=locked \
+  --mount=type=bind,source=./container/repro-sources-list.sh,target=/usr/local/bin/repro-sources-list.sh \
+  --mount=type=bind,source=./container/gvisor.key,target=/tmp/gvisor.key \
+  : "Hacky way to set a date for the Debian snapshot repos" && \
+  touch -d ${DEBIAN_ARCHIVE_DATE} /etc/apt/sources.list.d/debian.sources && \
+  touch -d ${DEBIAN_ARCHIVE_DATE} /etc/apt/sources.list && \
+  repro-sources-list.sh && \
+  : "Setup APT to install gVisor from its separate APT repo" && \
+  apt-get update && \
+  apt-get upgrade -y && \
+  apt-get install -y --no-install-recommends apt-transport-https ca-certificates gnupg && \
+  gpg -o /usr/share/keyrings/gvisor-archive-keyring.gpg --dearmor /tmp/gvisor.key && \
+  echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/gvisor-archive-keyring.gpg] https://storage.googleapis.com/gvisor/releases ${GVISOR_ARCHIVE_DATE} main" > /etc/apt/sources.list.d/gvisor.list && \
+  : "Install the necessary gVisor and Dangerzone dependencies" && \
+  apt-get update && \
+  apt-get install -y --no-install-recommends \
+      python3 python3-fitz libreoffice-nogui libreoffice-java-common \
+      python3 python3-magic default-jre-headless fonts-noto-cjk fonts-dejavu \
+      runsc unzip wget && \
+  : "Clean up for improving reproducibility (optional)" && \
+  rm -rf /var/cache/fontconfig/ && \
+  rm -rf /etc/ssl/certs/java/cacerts && \
+  rm -rf /var/log/* /var/cache/ldconfig/aux-cache
+
+# Download H2ORestart from GitHub using a pinned version and hash. Note that
+# it's available in Debian repos, but not in Bookworm yet.
 RUN mkdir /libreoffice_ext && cd libreoffice_ext \
     && H2ORESTART_FILENAME=h2orestart.oxt \
-    && H2ORESTART_VERSION="v0.6.6" \
     && wget https://github.com/ebandal/H2Orestart/releases/download/$H2ORESTART_VERSION/$H2ORESTART_FILENAME \
     && echo "$H2ORESTART_CHECKSUM  $H2ORESTART_FILENAME" | sha256sum -c \
-    && install -dm777 "/usr/lib/libreoffice/share/extensions/"
-
-
-###########################################
-# Dangerzone image
-
-FROM alpine:latest
-
-# Install dependencies
-RUN apk --no-cache -U upgrade && \
-    apk --no-cache add \
-    libreoffice \
-    openjdk8 \
-    python3 \
-    py3-magic \
-    font-noto-cjk
-
-COPY --from=pymupdf-build /usr/lib/python3.12/site-packages/fitz/ /usr/lib/python3.12/site-packages/fitz
-COPY --from=pymupdf-build /usr/lib/python3.12/site-packages/pymupdf/ /usr/lib/python3.12/site-packages/pymupdf
-COPY --from=pymupdf-build /usr/lib/python3.12/site-packages/PyMuPDF.libs/ /usr/lib/python3.12/site-packages/PyMuPDF.libs
-COPY --from=h2orestart-dl /libreoffice_ext/ /libreoffice_ext
-
-RUN install -dm777 "/usr/lib/libreoffice/share/extensions/"
-
-RUN mkdir -p /opt/dangerzone/dangerzone
-RUN touch /opt/dangerzone/dangerzone/__init__.py
-COPY conversion /opt/dangerzone/dangerzone/conversion
-
-# Add the unprivileged user. Set the UID/GID of the dangerzone user/group to
-# 1000, since we will point to it from the OCI config.
-#
-# NOTE: A tmpfs will be mounted over /home/dangerzone directory,
-# so nothing within it from the image will be persisted.
-RUN addgroup -g 1000 dangerzone && \
-    adduser -u 1000 -s /bin/true -G dangerzone -h /home/dangerzone -D dangerzone
-
-RUN GVISOR_URL="https://storage.googleapis.com/gvisor/releases/release/latest/$(uname -m)"; \
-    wget "${GVISOR_URL}/runsc" "${GVISOR_URL}/runsc.sha512" && \
-    sha512sum -c runsc.sha512 && \
-    rm -f runsc.sha512 && \
-    chmod 555 runsc && \
-    mv runsc /usr/bin/
-
+    && install -dm777 "/usr/lib/libreoffice/share/extensions/" \
+    && rm /root/.wget-hsts
+
+# Create an unprivileged user both for gVisor and for running Dangerzone.
+RUN mkdir -p /opt/dangerzone/dangerzone && \
+  touch /opt/dangerzone/dangerzone/__init__.py && \
+  addgroup --gid 1000 dangerzone && \
+  adduser --uid 1000 --ingroup dangerzone --shell /bin/true \
+      --disabled-password --home /home/dangerzone dangerzone
+
+COPY conversion/doc_to_pixels.py \
+    conversion/common.py \
+    conversion/errors.py \
+    conversion/__init__.py \
+    /opt/dangerzone/dangerzone/conversion
+
+# Let the entrypoint script write the OCI config for the inner container under
+# /config.json.
 RUN touch /config.json
 RUN chown dangerzone:dangerzone /config.json
 
diff --git a/dangerzone/conversion/doc_to_pixels.py b/dangerzone/conversion/doc_to_pixels.py
index 673760701..a7a777636 100644
--- a/dangerzone/conversion/doc_to_pixels.py
+++ b/dangerzone/conversion/doc_to_pixels.py
@@ -129,6 +129,8 @@ async def convert(self) -> None:
             # At least .odt, .docx, .odg, .odp, .ods, and .pptx
             "application/zip": {
                 "type": "libreoffice",
+                # NOTE: Older `file` command cannot detect hwpx files properly.
+                "libreoffice_ext": "h2orestart.oxt",
             },
             # At least .doc, .docx, .odg, .odp, .odt, .pdf, .ppt, .pptx, .xls, and .xlsx
             "application/octet-stream": {