diff --git a/test/ci/debian:testing/Dockerfile b/test/ci/debian:testing/Dockerfile
index 6cc06dec3..e42041dbd 100644
--- a/test/ci/debian:testing/Dockerfile
+++ b/test/ci/debian:testing/Dockerfile
@@ -1,48 +1,49 @@
 FROM debian:testing
 MAINTAINER Nicolas Richart <nicolas.richart@epfl.ch>
 
 RUN id
 
 RUN id _apt
 
 RUN ls -l /etc/apt/trusted.gpg.d/*
 
-RUN ls -l /etc/apt/*
+RUN ls -l /etc/apt/
 
+RUN apt-get install debian-keyring debian-archive-keyring
 RUN apt-get update
 
 # library dependencies
 RUN apt-get -qq update && apt-get -qq -y install \
     g++ gfortran clang cmake \
     openmpi-bin libmumps-dev libscotch-dev \
     libboost-dev libopenblas-dev \
     python3 python3-dev python3-numpy python3-scipy python3-mpi4py \
     && rm -rf /var/lib/apt/lists/*
 
 # for documentation
 RUN apt-get -qq update && apt-get -qq -y install \
     python3-sphinx \
     python3-sphinxcontrib.bibtex \
     python3-sphinx-rtd-theme \
     python3-breathe \
     python3-git python3-jinja2 \
     doxygen graphviz \
     && rm -rf /var/lib/apt/lists/*
 
 # for ci
 RUN apt-get -qq update && apt-get -qq -y install \
     gmsh python3-pytest python3-click python3-termcolor \
     ccache clang-format python3-flake8 python3-pip clang-tidy \
     curl git xsltproc jq \
     gcovr llvm binutils \
     ninja-build \
     && rm -rf /var/lib/apt/lists/*
 
 RUN pip3 install warning_parser
 
 COPY .openmpi /root/.openmpi
 
 # for debug
 RUN apt-get -qq update && apt-get -qq -y install \
     gdb valgrind \
     && rm -rf /var/lib/apt/lists/*