diff --git a/Dockerfile.demo b/Dockerfile.demo
index 5aee242..0fe0ff0 100644
--- a/Dockerfile.demo
+++ b/Dockerfile.demo
@@ -4,7 +4,8 @@ COPY docker/create-constraints.py docker/constraints.cfg docker/requirements.txt
 
 COPY versions.cfg /
 
-RUN python create-constraints.py constraints.cfg constraints.txt && \
+RUN pip install -r https://dist.plone.org/release/6.0.4/requirements.txt ${PIP_PARAMS} && \
+    python create-constraints.py constraints.cfg constraints.txt && \
     ./bin/pip install mxdev && \
     ./bin/mxdev -c mx.ini && \
     ./bin/pip install --ignore-requires-python -r requirements-mxdev.txt ${PIP_PARAMS} && \