diff --git a/dokku-update b/dokku-update
index 79df473..59af77b 100755
--- a/dokku-update
+++ b/dokku-update
@@ -56,35 +56,57 @@ dokku-update-plugin() {
   fi
 }
 
-main() {
+run-update() {
+  declare PROGRAM_NAME="$(basename "$0")"
   declare COMMAND="$1"
-  local DOKKU_DISTRO PLUGIN_NAME VERSION
+  declare PARAMETER="$2"
+  local DOKKU_DISTRO PLUGIN_NAME VERSION SYSTEM_UPDATES
 
   if [[ -f "/etc/os-release" ]]; then
     # shellcheck disable=SC1091
     DOKKU_DISTRO=$(. /etc/os-release && echo "$ID")
   fi
 
-  if [[ "$COMMAND" == "version" ]] || [[ "$COMMAND" == "-v" ]]; then
-    VERSION=UNRELEASED
-    if [[ -f "/var/lib/dokku-update/VERSION" ]]; then
-      VERSION="$(cat /var/lib/dokku-update/VERSION)"
-    fi
-    echo "dokku-update ${VERSION}"
-    exit 0
+  if [[ "$PARAMETER" == "-s" ]]; then
+    dokku-log-info "Running system updates"
+    SYSTEM_UPDATES=true
+  else
+    dokku-log-info "Updating Dokku"
+    SYSTEM_UPDATES=false
   fi
 
-  dokku-log-info "Running system updates"
   case "$DOKKU_DISTRO" in
     arch)
-      yay -Syyua
+      if [ "$SYSTEM_UPDATES" == true ]; then
+        yay -Syyua
+      else
+        yay -Syu docker-image-labeler dokku nginx plugn sshcommand
+      fi
       ;;
     debian | ubuntu)
       apt-get update -qq >/dev/null
-      apt-get -qq -y dist-upgrade
+
+      if [ "$SYSTEM_UPDATES" == true ]; then
+        apt-get -qq -y dist-upgrade
+      else
+        apt-get -qq -y install --only-upgrade docker-image-labeler dokku dokku-event-listener dokku-update gliderlabs-sigil herokuish netrc nginx plugn procfile-util sshcommand
+      fi
       ;;
-    centos | opensuse | rhel)
-      dokku-log-warn "Updating this operating system is not supported"
+    centos | rhel)
+      if [ "$SYSTEM_UPDATES" == true ]; then
+        yum -y update
+      else
+        yum -y update bind-utils cpio curl dos2unix docker-image-labeler git gliderlabs-sigil jq man-db nc netrc nginx plugn procfile-util sshcommand sudo unzip
+      fi
+      ;;
+    opensuse)
+      zypper refresh
+
+      if [ "$SYSTEM_UPDATES" == true ]; then
+        zypper -n update
+      else
+        zypper -n update bind-utils cpio curl dos2unix docker-image-labeler git gliderlabs-sigil jq man-db nc netrc nginx plugn procfile-util sshcommand sudo unzip
+      fi
       ;;
     *)
       dokku-log-warn "Updating this operating system is not supported"
@@ -109,4 +131,39 @@ main() {
   dokku cleanup --global
 }
 
-main "$@"
\ No newline at end of file
+print-help() {
+  echo "Updates Dokku & its dependencies, all enabled plugins and rebuilds all Dokku apps. Optionally installs all other system updates."
+  echo
+  echo "Usage: $PROGRAM_NAME [run|version]"
+  echo "  Options:"
+  echo "    version    Prints version of $PROGRAM_NAME"
+  echo "    run        Triggers the update process; when invoked with optional -s argument, all system updates will be installed"
+}
+
+print-version() {
+  local VERSION
+
+  VERSION=UNRELEASED
+  if [[ -f "/var/lib/dokku-update/VERSION" ]]; then
+    VERSION="$(cat /var/lib/dokku-update/VERSION)"
+  fi
+  echo "dokku-update ${VERSION}"
+}
+
+main() {
+  declare COMMAND="$1"
+
+  case "${COMMAND}" in
+    run)
+      run-update "$@"
+      ;;
+    --version | version | -v)
+      print-version
+      ;;
+    *)
+      print-help
+      ;;
+  esac
+}
+
+main "$@"