diff --git a/automotive/vehicle/tools/generate_annotation_enums.py b/automotive/vehicle/tools/generate_annotation_enums.py
index 512e945..460e9f9 100755
--- a/automotive/vehicle/tools/generate_annotation_enums.py
+++ b/automotive/vehicle/tools/generate_annotation_enums.py
@@ -32,7 +32,7 @@
 import tempfile
 
 # Keep this updated with the latest in-development property version.
-PROPERTY_VERSION = '3'
+PROPERTY_VERSION = '4'
 
 PROP_AIDL_FILE_PATH = ('hardware/interfaces/automotive/vehicle/aidl_property/android/hardware/' +
     'automotive/vehicle/VehicleProperty.aidl')