diff --git a/lib/self-upgrade.bash b/lib/self-upgrade.bash
index 7e60e10..fd9c49a 100644
--- a/lib/self-upgrade.bash
+++ b/lib/self-upgrade.bash
@@ -4,7 +4,37 @@
 
 # FUNCTIONS
 
-function self_upgrade {
+function hosted_upgrade {
+  cat >&2 <<EOF
+FAILURE:
+You are running inside a container within the HOSTED miaou mode.
+Perform the same action again underneath HOST machine!
+EOF
+  builtin exit 10
+}
+
+function development_upgrade {
+  echo TODO:...
+  # CHECK same user
+  # GIT CLONE
+  # INITIATE
+  :
+}
+
+function system_upgrade {
+  local current latest
+  current=$("$MIAOU_BASH_DIR"/bin/miaou-bash --version)
+  latest=$("$MIAOU_BASH_DIR"/tools/wget_semver artcode miaou/miaou-bash)
+  if [[ "$current" == "$latest" ]]; then
+    echo "up-to-date version: $current"
+  else
+    echo "new version available: $latest"
+    perform_upgrade
+  fi
+}
+
+function perform_upgrade {
+  sudo_root
   local backup="$MIAOU_BASH_DIR".before_upgrade
   sudo mv "$MIAOU_BASH_DIR" "$backup"
   if "$backup"/install.sh upgraded; then
@@ -21,14 +51,9 @@ function self_upgrade {
 # MAIN
 
 source "$MIAOU_BASH_DIR"/lib/functions.bash
-assert_system_mode
-
-current=$("$MIAOU_BASH_DIR"/bin/miaou-bash --version)
-latest=$("$MIAOU_BASH_DIR"/tools/wget_semver artcode miaou/miaou-bash)
-if [[ "$current" == "$latest" ]]; then
-  echo "up-to-date version: $current"
-else
-  echo "new version available: $latest"
-  sudo_root
-  self_upgrade
-fi
+fetch_mode
+case "$MIAOU_BASH_MODE" in
+hosted) hosted_upgrade ;;
+development) development_upgrade ;;
+system) system_upgrade ;;
+esac