diff --git a/Dockerfile.backend b/Dockerfile.backend
index 5cb13ef9da0f9912e3e88c1f0243df374b867f14..ed7f0e3086b1e95cdd78b2b98e627f82661d1386 100644
--- a/Dockerfile.backend
+++ b/Dockerfile.backend
@@ -30,12 +30,21 @@ RUN apt-get update \
         make \
         patch \
         procps \
-        reprepro \
         supervisor \
         tzdata \
         xzdec \
         zstd
 
+RUN mkdir -p /etc/apt/sources.list.d
+COPY docker/apt/*.list /etc/apt/sources.list.d/
+COPY docker/apt/*.gpg /usr/share/keyrings/
+
+# reprepro #697630
+RUN apt-get update \
+ && apt-get install -y \
+        apt-utils \
+        reprepro
+
 COPY . $WORKDIR
 
 RUN make -C $WORKDIR/dist install
diff --git a/docker/apt/collabora-archive-keyring.gpg b/docker/apt/collabora-archive-keyring.gpg
new file mode 100644
index 0000000000000000000000000000000000000000..2230cc79cd47bbfbe0ef99f6a83fd769a2a3a6d9
Binary files /dev/null and b/docker/apt/collabora-archive-keyring.gpg differ
diff --git a/docker/apt/collabora-tools.list b/docker/apt/collabora-tools.list
new file mode 100644
index 0000000000000000000000000000000000000000..a17c70c7b9bc1a3ac058cc1939c7302d1948ef9a
--- /dev/null
+++ b/docker/apt/collabora-tools.list
@@ -0,0 +1 @@
+deb [signed-by=/usr/share/keyrings/collabora-archive-keyring.gpg] https://repositories.collabora.co.uk/sysadmin/debian bullseye tools