diff --git a/prepare_environment.sh b/prepare_environment.sh
index d93ce46..90eaf32 100755
--- a/prepare_environment.sh
+++ b/prepare_environment.sh
@@ -47,6 +47,11 @@ DEFAULT_DOCKER_USER=${USER}
 read -e -p "Docker user [${DEFAULT_DOCKER_USER}]: " DOCKER_USER
 DOCKER_USER=${DOCKER_USER:-${DEFAULT_DOCKER_USER}}
 
+# syncstorage image tag
+DEFAULT_SYNCSTORAGE_IMAGE_TAG=latest
+read -e -rp "Syncstorage image tag [latest/<tag>] [${DEFAULT_SYNCSTORAGE_IMAGE_TAG}]: " SYNCSTORAGE_IMAGE_TAG
+SYNCSTORAGE_IMAGE_TAG=${SYNCSTORAGE_IMAGE_TAG:-${DEFAULT_SYNCSTORAGE_IMAGE_TAG}}
+
 # random passwords
 MARIADB_TOKENSERVER_PASSWORD=$(generate_random_string 24)
 MARIADB_SYNCSTORAGE_PASSWORD=$(generate_random_string 24)