diff --git a/default.xml b/default.xml
index 42b5c54..42f9fba 100644
--- a/default.xml
+++ b/default.xml
@@ -4,11 +4,11 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="refs/tags/aml_tz4_331012040"
+  <default revision="refs/tags/aml_per_331019040"
            remote="aosp"
            sync-j="4" />
 
-  <superproject name="platform/superproject" remote="aosp" revision="aml_tz4_331012040" />
+  <superproject name="platform/superproject" remote="aosp" revision="aml_per_331019040" />
   <contactinfo bugurl="go/repo-bug" />
 
   <project path="build/make" name="platform/build" groups="pdk" >
@@ -232,6 +232,7 @@
   <project path="external/gptfdisk" name="platform/external/gptfdisk" groups="pdk" />
   <project path="external/grpc-grpc" name="platform/external/grpc-grpc" groups="pdk,tradefed" />
   <project path="external/grpc-grpc-java" name="platform/external/grpc-grpc-java" groups="pdk,tradefed" />
+  <project path="external/gson" name="platform/external/gson" groups="pdk" />
   <project path="external/guava" name="platform/external/guava" groups="pdk" />
   <project path="external/guice" name="platform/external/guice" groups="pdk" />
   <project path="external/gwp_asan" name="platform/external/gwp_asan" groups="pdk" />