diff --git a/build.sh b/build.sh
index 7a0a6671..37d3809e 100644
--- a/build.sh
+++ b/build.sh
@@ -14,7 +14,7 @@ aosp="android-8.1.0_r62"
 phh="android-8.1"
 
 if [ "$1" == "android-9.0" ];then
-    aosp="android-9.0.0_r31"
+    aosp="android-9.0.0_r34"
     phh="android-9.0"
 fi