diff --git a/dev/build/Dockerfile b/dev/build/Dockerfile
index cc55c92881..c25298d652 100644
--- a/dev/build/Dockerfile
+++ b/dev/build/Dockerfile
@@ -10,9 +10,8 @@ RUN groupadd -g 1000 datatracker && \
 RUN apt-get purge -y imagemagick imagemagick-6-common
 
 # Install libreoffice (needed via PPT2PDF_COMMAND)
-RUN echo "deb http://deb.debian.org/debian bullseye-backports main" > /etc/apt/sources.list.d/bullseye-backports.list && \
-    apt-get update && \
-    apt-get -qyt bullseye-backports install libreoffice-nogui
+RUN apt-get update && \
+    apt-get -qy install libreoffice-nogui
 
 COPY . .
 COPY ./dev/build/start.sh ./start.sh