diff --git a/custom_components/gree_controller/manifest.json b/custom_components/gree_controller/manifest.json
index de35e07..553521e 100644
--- a/custom_components/gree_controller/manifest.json
+++ b/custom_components/gree_controller/manifest.json
@@ -1,7 +1,7 @@
 {
   "domain": "gree_controller",
   "name": "GREE Controller",
-  "version": "0.15.19",
+  "version": "0.15.20",
   "config_flow": true,
   "integration_type": "hub",
   "iot_class": "local_polling",
diff --git a/gree-controller/CHANGELOG.md b/gree-controller/CHANGELOG.md
index 045f661..b235c31 100644
--- a/gree-controller/CHANGELOG.md
+++ b/gree-controller/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## 0.15.20
+
+- Adds a new Visual Flow **Heating curve** block to the Sensors / values palette.
+- Provides a graphical X/Y curve editor with outdoor, device, zone, or numeric Home Assistant temperature as the input source.
+- Linearly interpolates target values between configured points and clamps values outside the X range to the nearest endpoint.
+- Allows the curve output to drive zone/group thermostat setpoints, GREE target temperature, or a configurable Home Assistant service-data field.
+- Shows the calculated dynamic value in Flow simulation/dry-run and adds validation/tests for curve points, native 8–30 °C targets, and wider Home Assistant outputs.
+- Adds a smoke check that keeps Flow block metadata and the user-visible block palette in sync.
+
 ## 0.15.19
 
 - Fixes Visual Flow `zone_thermostat` OFF semantics: `power=false` now powers the assigned unit off without setting the persistent Zone `enabled` flag to false.
diff --git a/gree-controller/README.md b/gree-controller/README.md
index 8d48340..30ed1e9 100644
--- a/gree-controller/README.md
+++ b/gree-controller/README.md
@@ -2,7 +2,7 @@
 
 Local GREE HVAC controller packaged as a Home Assistant add-on, with Web UI, HTTP/WebSocket API, built-in Swagger API documentation, UDP discovery/control, `amd64` and `aarch64` support, ingress, and database backup from `/data/gree-controller.db`.
 
-Version 0.15.19 fixes Flow thermostat OFF semantics: `zone_thermostat power=false` powers the assigned unit off without disabling the Zone, so Flow and thermostat evaluation remain active.
+Version 0.15.20 adds the Visual Flow heating-curve block with graphical X/Y points, selectable temperature sources, linear interpolation and dynamic setpoint binding for thermostats, GREE targets and Home Assistant service actions.
 
 ![Home Assistant OS + GREE + VLAN topology](https://git.linuxiarz.pl/gru/gree-controller-ha-addon/raw/branch/master/gree-controller/topology-ha-vlan-gree-en.png)
 
diff --git a/gree-controller/config.yaml b/gree-controller/config.yaml
index 6e3742d..2257506 100644
--- a/gree-controller/config.yaml
+++ b/gree-controller/config.yaml
@@ -1,5 +1,5 @@
 name: "GREE Controller"
-version: "0.15.19"
+version: "0.15.20"
 slug: "gree_controller"
 description: "Local GREE HVAC controller with Web UI, API, and Home Assistant integration"
 url: "https://git.linuxiarz.pl/gru/gree-controller-ha-addon/"