diff --git a/uppdatera_mac.sh b/uppdatera_mac.sh
new file mode 100644
index 0000000..fc7620d
--- /dev/null
+++ b/uppdatera_mac.sh
@@ -0,0 +1,68 @@
+#!/bin/bash
+
+set -e
+
+info() {
+    echo
+    echo "=================================================="
+    echo "$1"
+    echo "=================================================="
+}
+
+echo "Startar systemunderhåll..."
+
+#
+# macOS
+#
+
+info "Kontrollerar macOS-uppdateringar"
+
+UPDATES=$(softwareupdate -l 2>/dev/null || true)
+
+if echo "$UPDATES" | grep -q "\*"; then
+    echo "macOS-uppdateringar hittades."
+    echo
+
+    sudo softwareupdate -i -a
+else
+    echo "macOS är redan uppdaterat."
+fi
+
+#
+# Homebrew
+#
+
+info "Uppdaterar Homebrew"
+
+brew update
+
+info "Uppgraderar installerade paket"
+
+brew upgrade
+
+info "Tar bort onödiga beroenden"
+
+brew autoremove
+
+info "Städar cache och gamla versioner"
+
+brew cleanup --prune=all
+
+info "Kontrollerar Homebrew-installationen"
+
+brew doctor || true
+
+#
+# Omstartskontroll
+#
+
+info "Kontrollerar om omstart krävs"
+
+if [ -f /var/run/com.apple.softwareupdate.rebootrequired ]; then
+    echo "⚠️  macOS behöver startas om."
+else
+    echo "Ingen omstart krävs."
+fi
+
+echo
+echo "✅ Allt klart!"
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