diff --git a/defaults.sh b/defaults.sh
index 129770c..a423989 100755
--- a/defaults.sh
+++ b/defaults.sh
@@ -87,8 +87,10 @@ export LXD_CONFIG_PATH="$SS_ROOT_PATH/lxd"
 export LXD_UBUNTU_BASE_VERSION="jammy"
 export BASE_IMAGE_VM_NAME="ss-base-${LXD_UBUNTU_BASE_VERSION//./-}"
 export BASE_LXC_IMAGE="ubuntu/$LXD_UBUNTU_BASE_VERSION/cloud"
-export UBUNTU_BASE_IMAGE_NAME="ss-ubuntu-${LXD_UBUNTU_BASE_VERSION//./-}"
-export DOCKER_BASE_IMAGE_NAME="ss-docker-${LXD_UBUNTU_BASE_VERSION//./-}"
+WEEK_NUMBER=$(date +%U)
+export UBUNTU_BASE_IMAGE_NAME="ss-ubuntu-${LXD_UBUNTU_BASE_VERSION//./-}-$WEEK_NUMBER"
+
+export DOCKER_BASE_IMAGE_NAME="ss-docker-${LXD_UBUNTU_BASE_VERSION//./-}-$WEEK_NUMBER"
 
 export OTHER_SITES_LIST=
 export BTCPAY_ALT_NAMES=