diff --git a/datashare-python/datashare_python/logging_.py b/datashare-python/datashare_python/logging_.py
index 1afa8bf..2b70734 100644
--- a/datashare-python/datashare_python/logging_.py
+++ b/datashare-python/datashare_python/logging_.py
@@ -7,7 +7,7 @@
 
 from icij_common.logging_utils import DATE_FMT, STREAM_HANDLER_FMT
 from pythonjsonlogger.core import BaseJsonFormatter
-from pythonjsonlogger.orjson import OrjsonFormatter
+from pythonjsonlogger.json import JsonFormatter
 from temporalio import activity, workflow
 
 from .config import LogFormat, LogLevel
@@ -132,11 +132,9 @@ def _encode_value(value: Any) -> str:
         return "true" if value else "false"
     if isinstance(value, numbers.Number):
         return str(value)
-    return json.dumps(value).decode()
+    return json.dumps(value)
 
 
 def _json_formatter(datefmt: str) -> BaseJsonFormatter:
-    fmt = OrjsonFormatter(  # let's keep logging as fast as possible
-        _LOGGED_ATTRIBUTES, datefmt=datefmt
-    )
+    fmt = JsonFormatter(_LOGGED_ATTRIBUTES, datefmt=datefmt)
     return fmt
diff --git a/workers/extract-worker/.dockerignore b/workers/extract-worker/.dockerignore
index f1c3a14..9863aae 100644
--- a/workers/extract-worker/.dockerignore
+++ b/workers/extract-worker/.dockerignore
@@ -5,4 +5,5 @@
 !README.md
 !uv.dist.lock
 !uv.lock
-!io-worker-deps-exclusion.txt
\ No newline at end of file
+!io-worker-deps-exclusion.txt
+!base-worker-deps-exclusion.txt
diff --git a/workers/extract-worker/Dockerfile b/workers/extract-worker/Dockerfile
index 5d2ec6a..0658384 100644
--- a/workers/extract-worker/Dockerfile
+++ b/workers/extract-worker/Dockerfile
@@ -30,6 +30,18 @@ RUN uv python install 3.14t
 
 WORKDIR /app
 
+# Slim runtime base: same python:3.14-slim-trixie interpreter as extract-worker-builder
+# (so the venv copied from the *-build stages resolves its absolute interpreter path),
+# plus uv, but NO build toolchain. Workers are assembled by copying their /app on top.
+FROM python:3.14-slim-trixie AS runtime-base
+
+ENV PYTHONUNBUFFERED=1
+ENV UV_NO_DEV=1
+
+COPY --from=ghcr.io/astral-sh/uv:0.11.24 /uv /uvx /bin/
+
+WORKDIR /app
+
 # Flash attention libs has to be built on the hardware and is not available as a prebuild wheel. We don't want to do
 # it in the final image since it requires nvcc which is already embedded in Python deps and is super heavy. Sadly the
 # embedded version of nvcc is not usable for building
@@ -40,7 +52,7 @@ COPY --from=ghcr.io/astral-sh/uv:0.11.6 /uv /bin/
 RUN uv python install 3.14t
 
 # Install torch from the lockfile by install extras and skipping some packages
-RUN --mount=type=cache,target=~/.cache/uv \
+RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=bind,source=uv.dist.lock,target=uv.lock \
     --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
     uv sync --frozen --no-install-project --no-editable --extra base --extra gpu \
@@ -53,7 +65,7 @@ RUN --mount=type=bind,source=uv.dist.lock,target=uv.lock \
     uv export --frozen --extra base-gpu --no-dev | \
     sed -n 's/^flash-attn==\([^; ]*\).*/\1/p'  > flash-attn-version.txt
 
-RUN --mount=type=cache,target=~/.cache/uv \
+RUN --mount=type=cache,target=/root/.cache/uv \
     uv pip install pip && \
     MAX_JOBS=8 uv run python -m pip wheel "flash-attn==$(cat flash-attn-version.txt)" \
     --no-build-isolation --no-deps -w /flash-attn-wheel
@@ -62,7 +74,7 @@ RUN --mount=type=cache,target=~/.cache/uv \
 FROM extract-worker-builder AS io-worker
 ADD io-worker-deps-exclusion.txt ./
 # Install deps first to optimize layer cache
-RUN --mount=type=cache,target=~/.cache/uv \
+RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=bind,source=uv.dist.lock,target=uv.lock \
     --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
     uv sync -v --frozen --no-editable --no-install-project $(sed 's/^/--no-install-package /' io-worker-deps-exclusion.txt)
@@ -74,7 +86,7 @@ ADD extract_worker ./extract_worker/
 ADD entrypoints/io_worker.sh ./entrypoints/io_worker.sh
 
 # Then install service
-RUN --mount=type=cache,target=~/.cache/uv uv sync -v --frozen --no-editable $(sed 's/^/--no-install-package /' io-worker-deps-exclusion.txt)
+RUN --mount=type=cache,target=/root/.cache/uv uv sync -v --frozen --no-editable $(sed 's/^/--no-install-package /' io-worker-deps-exclusion.txt)
 RUN rm -rf ~/.cache/pip
 
 ENTRYPOINT ["entrypoints/io_worker.sh"]
@@ -88,12 +100,15 @@ RUN apt update && \
     rm -rf /var/lib/apt/lists/*
 
 
-FROM extract-base-builder AS extract-cpu-worker
+FROM extract-base-builder AS extract-cpu-build
+# Skip the mineru-only subtree: extract-core pulls mineru unconditionally, but docling/marker don't use it (and it conflicts with marker)
+ADD base-worker-deps-exclusion.txt ./
 # Install deps first to optimize layer cache
-RUN --mount=type=cache,target=~/.cache/uv \
+RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=bind,source=uv.dist.lock,target=uv.lock \
     --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
-    uv sync -v --frozen --no-editable --no-install-project --extra base --extra cpu
+    uv sync -v --frozen --no-editable --no-install-project --extra base --extra cpu \
+    $(sed 's/^/--no-install-package /' base-worker-deps-exclusion.txt)
 
 # Then copy code
 ADD uv.dist.lock ./uv.lock
@@ -102,23 +117,34 @@ ADD extract_worker ./extract_worker/
 ADD entrypoints/extract_cpu_worker.sh ./entrypoints/extract_cpu_worker.sh
 
 # Then install service
-RUN --mount=type=cache,target=~/.cache/uv uv sync -v --frozen --no-editable --extra base --extra cpu
+RUN --mount=type=cache,target=/root/.cache/uv uv sync -v --frozen --no-editable --extra base --extra cpu \
+    $(sed 's/^/--no-install-package /' base-worker-deps-exclusion.txt)
 RUN rm -rf ~/.cache/pip
 
+# Slim runtime: drop build-essential/g++ (only needed to build the venv), keep tesseract for OCR
+FROM runtime-base AS extract-cpu-worker
+RUN apt update && \
+    apt install -y --no-install-recommends tesseract-ocr && \
+    rm -rf /var/lib/apt/lists/*
+COPY --from=extract-cpu-build /app /app
+
 ENTRYPOINT ["entrypoints/extract_cpu_worker.sh"]
 
 
-FROM extract-base-builder AS extract-gpu-worker
+FROM extract-base-builder AS extract-gpu-build
 ## Copy the flash-attn wheel
 #COPY --from=flash-attn-builder /flash-attn-wheel /flash-attn-wheel
 ## Install the wheel
 #RUN uv pip install /flash-attn-wheel/*.whl --no-deps
 
+# Skip the mineru-only subtree: extract-core pulls mineru unconditionally, but docling/marker don't use it (and it conflicts with marker).
+ADD base-worker-deps-exclusion.txt ./
 # Install deps first to optimize layer cache
-RUN --mount=type=cache,target=~/.cache/uv \
+RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=bind,source=uv.dist.lock,target=uv.lock \
     --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
-    uv sync -v --frozen --no-editable --no-install-project --extra base --extra base --extra gpu #--no-install-package flash-attn
+    uv sync -v --frozen --no-editable --no-install-project --extra base --extra gpu \
+    $(sed 's/^/--no-install-package /' base-worker-deps-exclusion.txt) #--no-install-package flash-attn
 
 # Then copy code
 ADD uv.dist.lock ./uv.lock
@@ -127,15 +153,23 @@ ADD extract_worker ./extract_worker/
 ADD entrypoints/extract_gpu_worker.sh ./entrypoints/extract_gpu_worker.sh
 
 # Then install service
-RUN --mount=type=cache,target=~/.cache/uv uv sync -v --frozen --no-editable --extra base --extra gpu
+RUN --mount=type=cache,target=/root/.cache/uv uv sync -v --frozen --no-editable --extra base --extra gpu \
+    $(sed 's/^/--no-install-package /' base-worker-deps-exclusion.txt)
 RUN rm -rf ~/.cache/pip
 
+# Slim runtime (as extract-cpu-worker): no toolchain, keep tesseract
+FROM runtime-base AS extract-gpu-worker
+RUN apt update && \
+    apt install -y --no-install-recommends tesseract-ocr && \
+    rm -rf /var/lib/apt/lists/*
+COPY --from=extract-gpu-build /app /app
+
 ENTRYPOINT ["entrypoints/extract_gpu_worker.sh"]
 
 
 FROM extract-worker-builder AS extract-cpu-mineru-worker
 # Install deps first to optimize layer cache
-RUN --mount=type=cache,target=~/.cache/uv \
+RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=bind,source=uv.dist.lock,target=uv.lock \
     --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
     uv sync -v --frozen --no-editable --no-install-project --extra mineru --extra cpu
@@ -147,7 +181,7 @@ ADD extract_worker ./extract_worker/
 ADD entrypoints/extract_cpu_worker.sh ./entrypoints/extract_cpu_worker.sh
 
 # Then install service
-RUN --mount=type=cache,target=~/.cache/uv uv sync -v --frozen --no-editable --extra mineru --extra cpu
+RUN --mount=type=cache,target=/root/.cache/uv uv sync -v --frozen --no-editable --extra mineru --extra cpu
 RUN rm -rf ~/.cache/pip
 
 ENTRYPOINT ["entrypoints/extract_cpu_worker.sh"]
@@ -155,10 +189,10 @@ ENTRYPOINT ["entrypoints/extract_cpu_worker.sh"]
 
 FROM extract-worker-builder AS extract-gpu-mineru-worker
 # Install deps first to optimize layer cache
-RUN --mount=type=cache,target=~/.cache/uv \
+RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=bind,source=uv.dist.lock,target=uv.lock \
     --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
-    uv sync -v --frozen --no-editable --no-install-project --extra mineru --extra mineru --extra gpu
+    uv sync -v --frozen --no-editable --no-install-project --extra mineru --extra gpu
 
 # Then copy code
 ADD uv.dist.lock ./uv.lock
@@ -167,7 +201,7 @@ ADD extract_worker ./extract_worker/
 ADD entrypoints/extract_gpu_worker.sh ./entrypoints/extract_gpu_worker.sh
 
 # Then install service
-RUN --mount=type=cache,target=~/.cache/uv uv sync -v --frozen --no-editable --extra mineru --extra mineru --extra gpu
+RUN --mount=type=cache,target=/root/.cache/uv uv sync -v --frozen --no-editable --extra mineru --extra gpu
 RUN rm -rf ~/.cache/pip
 
 ENTRYPOINT ["entrypoints/extract_gpu_worker.sh"]
diff --git a/workers/extract-worker/base-worker-deps-exclusion.txt b/workers/extract-worker/base-worker-deps-exclusion.txt
new file mode 100644
index 0000000..3d68265
--- /dev/null
+++ b/workers/extract-worker/base-worker-deps-exclusion.txt
@@ -0,0 +1,15 @@
+mineru
+mineru-vl-utils
+modelscope
+magika
+reportlab
+pypdf
+fast-langdetect
+fasttext-predict
+json-repair
+robust-downloader
+loguru
+colorlog
+httpx-retries
+aiofiles
+xlsxwriter