diff --git a/build/Dockerfile b/build/Dockerfile
index be8c223b..18f028a6 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -150,9 +150,8 @@ RUN \
 
 RUN \
     # Install LibreOffice & unoconverter.
-    echo "deb http://deb.debian.org/debian bookworm-backports main" >> /etc/apt/sources.list &&\
     apt-get update -qq &&\
-    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends -t bookworm-backports libreoffice=1:7.0.4-4+deb11u8 &&\
+    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends libreoffice=4:7.4.7-1+deb12u1 &&\
     curl -Ls https://raw.githubusercontent.com/gotenberg/unoconverter/v0.0.1/unoconv -o /usr/bin/unoconverter &&\
     chmod +x /usr/bin/unoconverter &&\
     # unoconverter will look for the Python binary, which has to be at version 3.