diff --git a/cvmfs.sh b/cvmfs.sh
index 02627f1..b8e53a0 100644
--- a/cvmfs.sh
+++ b/cvmfs.sh
@@ -14,9 +14,37 @@ APT_PATH="${BASE_PATH}/apt"
 YUM_PATH="${BASE_PATH}/yum"
 export REPO_SIZE_FILE=/tmp/reposize.$RANDOM
 
+# CERN keeps only maintained versions of CVMFS
+ubuntu_os=(noble jammy focal)
+debian_os=(bookworm bullseye buster)
+deb_suffixes=(prod)
+declare -a debian_dists=()
+declare -a ubuntu_dists=()
+
+for deb_os in "${debian_os[@]}"; do
+   for suffix in "${deb_suffixes[@]}"; do
+       debian_dists+=("${deb_os}-${suffix}")
+   done
+done
+
+for ubuntu_os in "${ubuntu_os[@]}"; do
+   for suffix in "${deb_suffixes[@]}"; do
+       ubuntu_dists+=("${ubuntu_os}-${suffix}")
+   done
+done
+
+function join_by { local IFS="$1"; shift; echo "$*"; }
+ubuntu_dists_list=$(join_by ',' ${ubuntu_dists[@]})
+debian_dists_list=$(join_by ',' ${debian_dists[@]})
+
+echo "All Ubuntu codenames: $ubuntu_dists_list"
+echo "All Debian codenames: $debian_dists_list"
+
 # =================== APT repos ===============================
-"$apt_sync" --delete "${BASE_URL}/apt" bionic-prod,bookworm-prod,bullseye-prod,buster-prod,focal-prod,jammy-prod,jessie-prod,noble-prod,precise-prod,stable,stretch-prod,trusty-prod,xenial-prod main i386,amd64 "$APT_PATH"
-echo "APT finished"
+"$apt_sync" --delete "${BASE_URL}/apt" "$ubuntu_dists_list" main amd64,i386,amd64 "$APT_PATH"
+echo "Ubuntu finished"
+"$apt_sync" --delete "${BASE_URL}/apt" "$debian_dists_list" main amd64,i386,amd64 "$APT_PATH"
+echo "Debian finished"
 
 # =================== YUM/DNF repos ==========================
 "$yum_sync" "${BASE_URL}/yum/@{comp}/EL/@{os_ver}/@{arch}" 6-9 cvmfs,cvmfs-config,cvmfs-kernel aarch64,i386,ppc64le,x86_64 "@{comp}-EL@{os_ver}-@{arch}" "$YUM_PATH"