diff --git a/default.xml b/default.xml
index b41101a..ae7d54c 100644
--- a/default.xml
+++ b/default.xml
@@ -3,7 +3,7 @@
 
   <remote  name="aosp"
            fetch=".." />
-  <default revision="refs/tags/android-7.1.1_r47"
+  <default revision="refs/tags/android-7.1.1_r51"
            remote="aosp"
            sync-j="4" />
 
@@ -165,7 +165,6 @@
   <project path="external/jdiff" name="platform/external/jdiff" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/jemalloc" name="platform/external/jemalloc" groups="pdk" />
   <project path="external/jetty" name="platform/external/jetty" groups="pdk-fs" />
-  <project path="external/jhead" name="platform/external/jhead" groups="pdk" />
   <project path="external/jline" name="platform/external/jline" groups="notdefault,tradefed" />
   <project path="external/jmdns" name="platform/external/jmdns" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/jsilver" name="platform/external/jsilver" groups="pdk-cw-fs,pdk-fs" />
@@ -189,7 +188,6 @@
   <project path="external/libdaemon" name="platform/external/libdaemon" />
   <project path="external/libevent" name="platform/external/libevent" />
   <project path="external/libexif" name="platform/external/libexif" groups="pdk-cw-fs,pdk-fs" />
-  <project path="external/libgdx" name="platform/external/libgdx" groups="pdk" />
   <project path="external/libgsm" name="platform/external/libgsm" groups="pdk" />
   <project path="external/libhevc" name="platform/external/libhevc" groups="pdk-fs" />
   <project path="external/libjpeg-turbo" name="platform/external/libjpeg-turbo" groups="pdk" />