diff --git a/containers/jug/dev.Dockerfile b/containers/jug/dev.Dockerfile
index e484a17e9b3dfc2c5c53af965944ef7bce9896d3..ffae11e3a7ff0a3fbaf05dfb4d8ce1df5ab4de00 100644
--- a/containers/jug/dev.Dockerfile
+++ b/containers/jug/dev.Dockerfile
@@ -40,7 +40,7 @@ RUN git clone https://github.com/${SPACK_ORGREPO}.git ${SPACK_ROOT}     \
  && ln -s $SPACK_ROOT/share/spack/docker/entrypoint.bash                \
           /usr/sbin/spack-env                                           \
  && export PATH=${PATH}:${SPACK_ROOT}/bin                               \
- && spack config --scope site add "packages:all:target:[x86_64_v3]"     \
+ && spack config --scope site add "packages:all:require:arch=x86_64"    \
  && spack config blame packages                                         \
  && spack config --scope site add "config:suppress_gpg_warnings:true"   \
  && spack config --scope site add "config:build_jobs:64"                \
@@ -93,7 +93,7 @@ RUN git clone https://github.com/${EICSPACK_ORGREPO}.git ${EICSPACK_ROOT}     \
 COPY spack.yaml /opt/spack-environment/
 RUN rm -r /usr/local                                                    \
  && spack env activate /opt/spack-environment/                          \
- && spack concretize
+ && spack concretize --fresh
 
 
 ## Now execute the main build (or fetch from cache if possible)