diff --git a/Dockerfile b/Dockerfile
index 043fd77..5d6cf2a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -58,7 +58,7 @@ RUN echo "deb-src http://deb.debian.org/debian bookworm main contrib" >> /etc/ap
     && find /tmp/ -type f -name "Makefil*" -delete \
     && find /tmp/ -type f -name "*.in" -delete 
 # Install
-FROM debian:bullseye-slim
+FROM debian:bookworm-slim
 COPY --from=buildsquid --chown=1161 /tmp/src/auth/basic/LDAP/basic_ldap_auth /usr/lib/squid/ 
 COPY --from=buildsquid --chown=1161 /tmp/src/auth/digest/LDAP/digest_ldap_auth /usr/lib/squid/ 
 COPY --from=buildsquid --chown=1161 /tmp/src/auth/negotiate/kerberos/negotiate_kerberos_auth /usr/lib/squid/