diff --git a/thermal/aidl/Android.bp b/thermal/aidl/Android.bp
index 597a166..db77783 100644
--- a/thermal/aidl/Android.bp
+++ b/thermal/aidl/Android.bp
@@ -48,8 +48,7 @@
             version: "2",
             imports: [],
         },
-
     ],
-    frozen: true,
+    frozen: false,
 
 }
diff --git a/thermal/aidl/aidl_api/android.hardware.thermal/current/android/hardware/thermal/IThermalChangedCallback.aidl b/thermal/aidl/aidl_api/android.hardware.thermal/current/android/hardware/thermal/IThermalChangedCallback.aidl
index 5e1d753..779544b 100644
--- a/thermal/aidl/aidl_api/android.hardware.thermal/current/android/hardware/thermal/IThermalChangedCallback.aidl
+++ b/thermal/aidl/aidl_api/android.hardware.thermal/current/android/hardware/thermal/IThermalChangedCallback.aidl
@@ -36,4 +36,5 @@
 @VintfStability
 interface IThermalChangedCallback {
   oneway void notifyThrottling(in android.hardware.thermal.Temperature temperature);
+  oneway void notifyThresholdChanged(in android.hardware.thermal.TemperatureThreshold threshold);
 }
diff --git a/thermal/aidl/android/hardware/thermal/IThermalChangedCallback.aidl b/thermal/aidl/android/hardware/thermal/IThermalChangedCallback.aidl
index 105f085..1ff4b7a 100644
--- a/thermal/aidl/android/hardware/thermal/IThermalChangedCallback.aidl
+++ b/thermal/aidl/android/hardware/thermal/IThermalChangedCallback.aidl
@@ -17,6 +17,7 @@
 package android.hardware.thermal;
 
 import android.hardware.thermal.Temperature;
+import android.hardware.thermal.TemperatureThreshold;
 
 /**
  * IThermalChangedCallback send throttling notification to clients.
@@ -25,11 +26,19 @@
 @VintfStability
 interface IThermalChangedCallback {
     /**
-     * Send a thermal throttling event to all ThermalHAL
+     * Send a thermal throttling event to all Thermal HAL
      * thermal event listeners.
      *
      * @param temperature The temperature associated with the
      *    throttling event.
      */
     oneway void notifyThrottling(in Temperature temperature);
+
+    /**
+     * Send a thermal threshold change event to all Thermal HAL
+     * thermal event listeners.
+     *
+     * @param threshold The temperature threshold that changed.
+     */
+    oneway void notifyThresholdChanged(in TemperatureThreshold threshold);
 }
diff --git a/thermal/aidl/default/Android.bp b/thermal/aidl/default/Android.bp
index 9fe62ce..9d89903 100644
--- a/thermal/aidl/default/Android.bp
+++ b/thermal/aidl/default/Android.bp
@@ -27,7 +27,7 @@
     vendor: true,
     stl: "c++_static",
     static_libs: [
-        "android.hardware.thermal-V2-ndk",
+        "android.hardware.thermal-V3-ndk",
         "libbase",
     ],
     shared_libs: [
diff --git a/thermal/aidl/default/thermal-example.xml b/thermal/aidl/default/thermal-example.xml
index 08dc68c..148ddbf 100644
--- a/thermal/aidl/default/thermal-example.xml
+++ b/thermal/aidl/default/thermal-example.xml
@@ -1,7 +1,7 @@
 <manifest version="1.0" type="device">
     <hal format="aidl">
         <name>android.hardware.thermal</name>
-        <version>2</version>
+        <version>3</version>
         <fqname>IThermal/default</fqname>
     </hal>
 </manifest>
diff --git a/thermal/aidl/vts/Android.bp b/thermal/aidl/vts/Android.bp
index 0812811..8235be2 100644
--- a/thermal/aidl/vts/Android.bp
+++ b/thermal/aidl/vts/Android.bp
@@ -32,7 +32,7 @@
         "libbinder_ndk",
     ],
     static_libs: [
-        "android.hardware.thermal-V2-ndk",
+        "android.hardware.thermal-V3-ndk",
     ],
     test_suites: [
         "vts",
diff --git a/thermal/aidl/vts/VtsHalThermalTargetTest.cpp b/thermal/aidl/vts/VtsHalThermalTargetTest.cpp
index 7f33e2d..066e773 100644
--- a/thermal/aidl/vts/VtsHalThermalTargetTest.cpp
+++ b/thermal/aidl/vts/VtsHalThermalTargetTest.cpp
@@ -93,6 +93,10 @@
         return ndk::ScopedAStatus::ok();
     }
 
+    ndk::ScopedAStatus notifyThresholdChanged(const TemperatureThreshold&) {
+        return ndk::ScopedAStatus::ok();
+    }
+
     template <typename R, typename P>
     [[nodiscard]] bool waitForCallback(std::chrono::duration<R, P> duration) {
         std::unique_lock<std::mutex> lock(mMutex);