diff --git a/Dockerfile b/Dockerfile
index ce0d827..1d730eb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
-FROM debian:bullseye-slim as buildsquid
+FROM debian:bookworm-slim as buildsquid
 ARG SQUID_VERSION
 ENV ENV_SQUID_VERSION=$SQUID_VERSION
 WORKDIR /tmp
-RUN echo "deb-src http://deb.debian.org/debian bullseye main contrib" >> /etc/apt/sources.list && apt-get update && apt-get --no-upgrade --no-install-recommends -y build-dep squid && apt-get --no-install-recommends -y install wget tar xz-utils libssl-dev libssl1.1 winbind \
+RUN echo "deb-src http://deb.debian.org/debian bookworm main contrib" >> /etc/apt/sources.list && apt-get update && apt-get --no-upgrade --no-install-recommends -y build-dep squid && apt-get --no-install-recommends -y install wget tar xz-utils libssl-dev libssl1.1 winbind \
     && wget --progress=dot:giga http://www.squid-cache.org/Versions/v5/$SQUID_VERSION \
     && tar -C /tmp --strip-components=1 -xzf $SQUID_VERSION \
     && ./configure \