diff --git a/biometrics/fingerprint/aidl/aidl_api/android.hardware.biometrics.fingerprint/current/android/hardware/biometrics/fingerprint/ISession.aidl b/biometrics/fingerprint/aidl/aidl_api/android.hardware.biometrics.fingerprint/current/android/hardware/biometrics/fingerprint/ISession.aidl
index 00a08ba..4df7981 100644
--- a/biometrics/fingerprint/aidl/aidl_api/android.hardware.biometrics.fingerprint/current/android/hardware/biometrics/fingerprint/ISession.aidl
+++ b/biometrics/fingerprint/aidl/aidl_api/android.hardware.biometrics.fingerprint/current/android/hardware/biometrics/fingerprint/ISession.aidl
@@ -26,7 +26,7 @@
   void enumerateEnrollments(in int cookie);
   void removeEnrollments(in int cookie, in int[] enrollmentIds);
   void getAuthenticatorId(in int cookie);
-  void invalidateAuthenticatorId(in int cookie, in android.hardware.keymaster.HardwareAuthToken hat);
+  void invalidateAuthenticatorId(in int cookie);
   void resetLockout(in int cookie, in android.hardware.keymaster.HardwareAuthToken hat);
   void onPointerDown(in int pointerId, in int x, in int y, in float minor, in float major);
   void onPointerUp(in int pointerId);
diff --git a/biometrics/fingerprint/aidl/android/hardware/biometrics/fingerprint/ISession.aidl b/biometrics/fingerprint/aidl/android/hardware/biometrics/fingerprint/ISession.aidl
index da767be..09bd04d 100644
--- a/biometrics/fingerprint/aidl/android/hardware/biometrics/fingerprint/ISession.aidl
+++ b/biometrics/fingerprint/aidl/android/hardware/biometrics/fingerprint/ISession.aidl
@@ -301,16 +301,9 @@
      *
      * When invoked by the framework, the implementation must perform the following sequence of
      * events:
-     *   1) Verify the authenticity and integrity of the provided HAT. If this check fails, the HAL
-     *      must invoke ISessionCallback#onError with Error::UNABLE_TO_PROCESS and return to
-     *      SessionState::IDLING if no subsequent work is in the queue.
-     *   2) Verify that the timestamp provided within the HAT is relatively recent (e.g. on the
-     *      order of minutes, not hours). If this check fails, the HAL must invoke
-     *      ISessionCallback#onError with Error::UNABLE_TO_PROCESS and return to
-     *      SessionState::IDLING if no subsequent work is in the queue.
-     *   3) Update the authenticatorId with a new entropy-encoded random number
-     *   4) Persist the new authenticatorId to non-ephemeral storage
-     *   5) Notify the framework that the above is completed, via
+     *   1) Update the authenticatorId with a new entropy-encoded random number
+     *   2) Persist the new authenticatorId to non-ephemeral storage
+     *   3) Notify the framework that the above is completed, via
      *      ISessionCallback#onAuthenticatorInvalidated
      *
      * A practical use case of invalidation would be when the user adds a new enrollment to a sensor
@@ -321,9 +314,8 @@
      *
      * @param cookie An identifier used to track subsystem operations related to this call path. The
      *               client must guarantee that it is unique per ISession.
-     * @param hat HardwareAuthToken that must be validated before proceeding with this operation.
      */
-    void invalidateAuthenticatorId(in int cookie, in HardwareAuthToken hat);
+    void invalidateAuthenticatorId(in int cookie);
 
     /**
      * resetLockout:
diff --git a/biometrics/fingerprint/aidl/default/Session.cpp b/biometrics/fingerprint/aidl/default/Session.cpp
index 96f1e56..bf08203 100644
--- a/biometrics/fingerprint/aidl/default/Session.cpp
+++ b/biometrics/fingerprint/aidl/default/Session.cpp
@@ -79,8 +79,7 @@
     return ndk::ScopedAStatus::ok();
 }
 
-ndk::ScopedAStatus Session::invalidateAuthenticatorId(int32_t /*cookie*/,
-                                                      const keymaster::HardwareAuthToken& /*hat*/) {
+ndk::ScopedAStatus Session::invalidateAuthenticatorId(int32_t /*cookie*/) {
     return ndk::ScopedAStatus::ok();
 }
 
diff --git a/biometrics/fingerprint/aidl/default/Session.h b/biometrics/fingerprint/aidl/default/Session.h
index 05c570c..ed3ae3f 100644
--- a/biometrics/fingerprint/aidl/default/Session.h
+++ b/biometrics/fingerprint/aidl/default/Session.h
@@ -49,8 +49,7 @@
 
     ndk::ScopedAStatus getAuthenticatorId(int32_t cookie) override;
 
-    ndk::ScopedAStatus invalidateAuthenticatorId(int32_t cookie,
-                                                 const keymaster::HardwareAuthToken& hat) override;
+    ndk::ScopedAStatus invalidateAuthenticatorId(int32_t cookie) override;
 
     ndk::ScopedAStatus resetLockout(int32_t cookie,
                                     const keymaster::HardwareAuthToken& hat) override;