diff --git a/lib/self-upgrade.bash b/lib/self-upgrade.bash
index f915234..169a5c8 100755
--- a/lib/self-upgrade.bash
+++ b/lib/self-upgrade.bash
@@ -2,8 +2,34 @@
 
 # CONSTANTS
 
+#FIXME: source from functions.bash
+readonly DESTINATION=/opt
+readonly MAIN_TAR_GZ_URL="https://git.artcode.re/miaou/miaou-bash/archive/main.tar.gz"
+
 # FUNCTIONS
 
+#FIXME: source from functions.bash
+function bootstrap {
+  if [[ ! -d "$DESTINATION/miaou-bash" ]]; then
+    local temp_dir
+    temp_dir=$(mktemp -d)
+    pushd "$temp_dir" >/dev/null || return 2
+    curl -s -O $MAIN_TAR_GZ_URL
+    tar -xzf main.tar.gz --directory "$DESTINATION"
+    echo "directory: miaou-bash successfully deployed to $DESTINATION"
+    popd >/dev/null || return 3
+  fi
+
+  local source_bin="$DESTINATION/miaou-bash/bin/miaou-bash"
+  local dest_bin="/usr/bin/miaou-bash"
+  if ! cmp -s "$source_bin" "$dest_bin"; then
+    cp -f "$source_bin" "$dest_bin"
+    echo "executable: /usr/bin/miaou-bash freshly created"
+  fi
+
+  export MIAOU_BASH_DIR="$DESTINATION/miaou-bash"
+}
+
 # MAIN
 
 [[ "$UID" -ne 0 ]] && echo 'root privilege required' && exit 1
@@ -14,9 +40,8 @@ latest=$("$MIAOU_BASH_DIR/tools/wget_semver" artcode miaou/miaou-bash)
 if [[ "$current" == "$latest" ]]; then
   echo "up-to-date version: $current"
 else
-  OLD_DIR="$MIAOU_BASH_DIR"
-  export -n MIAOU_BASH_DIR
-  unset MIAOU_BASH_DIR
-  source "$OLD_DIR/install.sh"
+  bootstrap
+  miaou-bash "$MIAOU_BASH_DIR/lib/init.bash"
+  echo "miaou-bash successfully updated"
   miaou-bash --version
 fi