diff --git a/META-INF/com/google/android/update-binary b/META-INF/com/google/android/update-binary
index 7a1afb7..284826e 100755
--- a/META-INF/com/google/android/update-binary
+++ b/META-INF/com/google/android/update-binary
@@ -52,6 +52,7 @@ mount_apex() {
   [ -d /system_root/system/apex ] || return 1;
   local apex dest loop minorx num var;
   setup_mountpoint /apex;
+  $BB mount -t tmpfs tmpfs /apex -o mode=755 && $BB touch /apex/apextmp;
   minorx=1;
   [ -e /dev/block/loop1 ] && minorx=$($BB ls -l /dev/block/loop1 | $BB awk '{ print $6 }');
   num=0;
@@ -89,6 +90,7 @@ mount_apex() {
   $($BB grep -o 'export .* /.*' /system_root/init.environ.rc | $BB sed 's; /;=/;'); unset export;
 }
 umount_apex() {
+  [ -d /apex ] || return 1;
   local dest loop var;
   for var in $($BB grep -o 'export .* /.*' /system_root/init.environ.rc 2>/dev/null | $BB awk '{ print $2 }'); do
     if [ "$(eval echo \$OLD_$var)" ]; then
@@ -103,6 +105,7 @@ umount_apex() {
     $BB umount -l $dest;
     [ "$loop" ] && $BB losetup -d $loop;
   done;
+  [ -f /apex/apextmp ] && $BB umount /apex;
   $BB rm -rf /apex 2>/dev/null;
 }
 mount_all() {
diff --git a/META-INF/com/google/android/updater-script b/META-INF/com/google/android/updater-script
index c984734..dcc55de 100644
--- a/META-INF/com/google/android/updater-script
+++ b/META-INF/com/google/android/updater-script
@@ -3,4 +3,4 @@
 # Dummy file; update-binary is a shell script (DO NOT CHANGE)
 #
 #
-# AK_BASE_VERSION=20211016
+# AK_BASE_VERSION=20211018