diff --git a/backend/Dockerfile_CPU b/backend/Dockerfile_CPU
index d2889612..921420fa 100644
--- a/backend/Dockerfile_CPU
+++ b/backend/Dockerfile_CPU
@@ -22,7 +22,7 @@ RUN pip install -r /tmp/docker-requirements.txt
 
 COPY requirements.txt /tmp/requirements.txt
 COPY api-requirements.txt /tmp/api-requirements.txt
-RUN pip install -r /tmp/requirements.txt
+RUN pip install --use-deprecated=legacy-resolver -r /tmp/requirements.txt
 
 COPY docker/ramp/solaris /tmp/solaris
 RUN pip install /tmp/solaris --use-feature=in-tree-build && \