diff --git a/core/android_soong_config_vars.mk b/core/android_soong_config_vars.mk
index ee15b75..4749694 100644
--- a/core/android_soong_config_vars.mk
+++ b/core/android_soong_config_vars.mk
@@ -83,7 +83,7 @@
   # This sets the default for building ART APEXes from source rather than
   # prebuilts (in packages/modules/ArtPrebuilt and prebuilt/module_sdk/art) in
   # all other platform builds.
-  SOONG_CONFIG_art_module_source_build ?= false
+  SOONG_CONFIG_art_module_source_build ?= true
 endif
 
 # Apex build mode variables
diff --git a/core/build_id.mk b/core/build_id.mk
index ba5ca42..2f9c3f3 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-BUILD_ID=AOSP.MASTER
+BUILD_ID=MASTER
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 006dff0..8432513 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -85,7 +85,7 @@
     #  It must be of the form "YYYY-MM-DD" on production devices.
     #  It must match one of the Android Security Patch Level strings of the Public Security Bulletins.
     #  If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-    PLATFORM_SECURITY_PATCH := 2021-10-05
+    PLATFORM_SECURITY_PATCH := 2021-11-05
 endif
 .KATI_READONLY := PLATFORM_SECURITY_PATCH
 
diff --git a/target/product/gsi_release.mk b/target/product/gsi_release.mk
index 94917f5..aaeefcb 100644
--- a/target/product/gsi_release.mk
+++ b/target/product/gsi_release.mk
@@ -62,8 +62,12 @@
     init.gsi.rc \
     init.vndk-nodef.rc \
 
-# Support additional P, Q and R VNDK packages
-PRODUCT_EXTRA_VNDK_VERSIONS := 28 29 30
+# Support additional VNDK snapshots
+PRODUCT_EXTRA_VNDK_VERSIONS := \
+    28 \
+    29 \
+    30 \
+    31 \
 
 # Do not build non-GSI partition images.
 PRODUCT_BUILD_CACHE_IMAGE := false