diff --git a/util/container/Dockerfile b/util/container/Dockerfile
index 230774b04..11bfd4ac7 100644
--- a/util/container/Dockerfile
+++ b/util/container/Dockerfile
@@ -162,8 +162,10 @@ ENV VIRTUAL_ENV "/root/.venvs/snitch_cluster"
 RUN /opt/python/bin/python3 -m venv ${VIRTUAL_ENV}
 ENV PATH="${VIRTUAL_ENV}/bin:${PATH}"
 # Install Python requirements
-COPY pyproject.toml .
-RUN pip install .[docs]
+COPY pyproject.toml /tmp/pyproject.toml
+RUN pip install pip-tools
+RUN pip-compile --extra docs -o /tmp/requirements.txt /tmp/pyproject.toml
+RUN pip install -r /tmp/requirements.txt
 
 # Add Verilator to PATH
 ENV PATH "/tools/verilator/bin:${PATH}"