diff --git a/.env.development b/.env.development
index a72194a..2d7513b 100644
--- a/.env.development
+++ b/.env.development
@@ -6,6 +6,6 @@ NEXT_PUBLIC_USE_MOCK_BACKEND_LOOP_START=false
 NEXT_PUBLIC_EXPORT_STATIC=false
 NEXT_PUBLIC_USE_CGI=false
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.739
+NEXT_PUBLIC_APP_VERSION=1.6.740
 NEXT_PUBLIC_CPL_MODE=json   # json (Entwicklungsumgebung) oder jsSimulatedProd (CPL ->CGI-Interface-Simulator) oder production (CPL-> CGI-Interface Platzhalter)
 
diff --git a/.env.production b/.env.production
index 54ad138..033686c 100644
--- a/.env.production
+++ b/.env.production
@@ -5,5 +5,5 @@ NEXT_PUBLIC_CPL_API_PATH=/CPL
 NEXT_PUBLIC_EXPORT_STATIC=true
 NEXT_PUBLIC_USE_CGI=true
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.739
+NEXT_PUBLIC_APP_VERSION=1.6.740
 NEXT_PUBLIC_CPL_MODE=production
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bcba804..27ad0ed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## [1.6.740] – 2025-08-18
+
+- feat: system dark and light mode
+
+---
 ## [1.6.739] – 2025-08-18
 
 - feat: Dashboard light and dark mode
diff --git a/components/main/system/SystemView.tsx b/components/main/system/SystemView.tsx
index a04f7d0..50eae83 100644
--- a/components/main/system/SystemView.tsx
+++ b/components/main/system/SystemView.tsx
@@ -74,7 +74,7 @@ const SystemPage = () => {
   };
 
   return (
-    <div className="p-4">
+    <div className="p-4 bg-white dark:bg-gray-900">
       <h1 className="text-xl font-bold mb-4">
         System Spannungen & Temperaturen
       </h1>
diff --git a/package-lock.json b/package-lock.json
index 7b94591..76e6be7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.739",
+  "version": "1.6.740",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "cpl-v4",
-      "version": "1.6.739",
+      "version": "1.6.740",
       "dependencies": {
         "@fontsource/roboto": "^5.1.0",
         "@headlessui/react": "^2.2.4",
diff --git a/package.json b/package.json
index 40c8aa4..fd5c66e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.739",
+  "version": "1.6.740",
   "private": true,
   "scripts": {
     "dev": "next dev",