Used version number and remove explicit dependency

build.sh

@@ -49,7 +49,7 @@ if [ "${1}x" == "x" ] || [ "${1}" == "--help" ] || [ "${1}" == "-h" ]; then
   echo "  DOCKERFILE  The name of Dockerfile to use."
   echo "              Default: Dockerfile"
   echo "  DOCKER_FROM The base image to use."
-  echo "              Default: 'debian:bullseye-slim'"
+  echo "              Default: 'debian:11-slim'"
   echo "  DOCKER_TARGET A specific target to build."
   echo "              It's currently not possible to pass multiple targets."
   echo "              Default: main"
@@ -170,7 +170,7 @@ fi
 # Determining the value for DOCKER_FROM
 ###
 if [ -z "$DOCKER_FROM" ]; then
-  DOCKER_FROM="debian:bullseye-slim"
+  DOCKER_FROM="debian:11-slim"
 fi
 
 ###