diff --git a/esphome/esp-loungesouthleftswitch.yaml b/esphome/esp-loungesouthleftswitch.yaml
index 00ff031..7c25542 100644
--- a/esphome/esp-loungesouthleftswitch.yaml
+++ b/esphome/esp-loungesouthleftswitch.yaml
@@ -6,6 +6,7 @@
 # https://home.fox.co.nz/gitea/zorruno/zorruno-homeassistant/src/branch/master/esphome/esp-loungesouthleftswitch.yaml
 #:########################################################################################:#
 # VERSIONS:
+# V4.2 2026-07-25 Standardized MQTT payloads: "ON"/"OFF" → "On"/"Off"
 # V4.1 2026-03-11 Updated yaml to zorruno layout V1.1
 # V4.0 2025-10-04 Copied from other device
 #:########################################################################################:#
@@ -70,7 +71,7 @@ substitutions:
 
   # Project Naming
   project_name: "Zemismart Technologies.KS-811 Double" # Project Details
-  project_version: "v4.1" # Project V denotes release of yaml file, allowing checking of deployed vs latest version
+  project_version: "v4.2" # Project V denotes release of yaml file, allowing checking of deployed vs latest version
 
   # Passwords & Secrets
   api_key: !secret esp-api_key # unfortunately you can't use substitutions inside secrets names