diff --git a/default.xml b/default.xml
index 755dfe9..59aa32e 100644
--- a/default.xml
+++ b/default.xml
@@ -16,11 +16,11 @@
     <copyfile src="base/gradle.properties" dest="tools/gradle.properties" />
   </project>
 
-  <project path="external/ant-glob" name="platform/external/ant-glob" revision="master" />
-  <project path="external/eclipse-windowbuilder" name="platform/external/eclipse-windowbuilder" revision="master" />
-  <project path="external/gtest" name="platform/external/gtest" revision="master" groups="gpu" />
-  <project path="external/emma" name="platform/external/emma" revision="master"/>
-  <project path="external/gmock" name="platform/external/gmock" revision="master" groups="gpu" />
+  <project path="external/ant-glob" name="platform/external/ant-glob" revision="main" />
+  <project path="external/eclipse-windowbuilder" name="platform/external/eclipse-windowbuilder" revision="main" />
+  <project path="external/gtest" name="platform/external/gtest" revision="main" groups="gpu" />
+  <project path="external/emma" name="platform/external/emma" revision="main"/>
+  <project path="external/gmock" name="platform/external/gmock" revision="main" groups="gpu" />
   <project path="external/protobuf" name="platform/external/protobuf" />
   <project path="external/qemu" name="platform/external/qemu" />
   <project path="external/qemu-android" name="platform/external/qemu-android" />
@@ -30,32 +30,32 @@
   <project path="prebuilts/android-emulator-build/mesa" name="platform/prebuilts/android-emulator-build/mesa" clone-depth="1" />
   <project path="prebuilts/android-emulator-build/mesa-deps" name="platform/prebuilts/android-emulator-build/mesa-deps" clone-depth="1" />
   <project path="prebuilts/android-emulator-build/qemu-android-deps" name="platform/prebuilts/android-emulator-build/qemu-android-deps" clone-depth="1" />
-  <project path="prebuilts/clang/darwin-x86/host/3.5" name="platform/prebuilts/clang/darwin-x86/host/3.5" revision="master" groups="gpu" />
-  <project path="prebuilts/clang/darwin-x86/sdk/3.5" name="platform/prebuilts/clang/darwin-x86/sdk/3.5" revision="master" />
-  <project path="prebuilts/eclipse-build-deps" name="platform/prebuilts/eclipse-build-deps" revision="master" />
-  <project path="prebuilts/eclipse-build-deps-sources" name="platform/prebuilts/eclipse-build-deps-sources" revision="master" />
-  <project path="prebuilts/eclipse" name="platform/prebuilts/eclipse" revision="master"/>
-  <project path="prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6" name="platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6" revision="master" />
-  <project path="prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.8" name="platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.8" revision="master" groups="gpu" />
-  <project path="prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8" name="platform/prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8" revision="master" groups="gpu" />
+  <project path="prebuilts/clang/darwin-x86/host/3.5" name="platform/prebuilts/clang/darwin-x86/host/3.5" revision="main" groups="gpu" />
+  <project path="prebuilts/clang/darwin-x86/sdk/3.5" name="platform/prebuilts/clang/darwin-x86/sdk/3.5" revision="main" />
+  <project path="prebuilts/eclipse-build-deps" name="platform/prebuilts/eclipse-build-deps" revision="main" />
+  <project path="prebuilts/eclipse-build-deps-sources" name="platform/prebuilts/eclipse-build-deps-sources" revision="main" />
+  <project path="prebuilts/eclipse" name="platform/prebuilts/eclipse" revision="main"/>
+  <project path="prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6" name="platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6" revision="main" />
+  <project path="prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.8" name="platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.8" revision="main" groups="gpu" />
+  <project path="prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8" name="platform/prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8" revision="main" groups="gpu" />
   <project path="prebuilts/go/linux-x86" name="platform/prebuilts/go/linux-x86" groups="gpu" />
   <project path="prebuilts/go/darwin-x86" name="platform/prebuilts/go/darwin-x86" groups="gpu" />
   <project path="prebuilts/go/windows-x86" name="platform/prebuilts/go/windows-x86" groups="gpu" />
-  <project path="prebuilts/qemu-kernel" name="platform/prebuilts/qemu-kernel" revision="master" />
-  <project path="prebuilts/tools" name="platform/prebuilts/tools" revision="master" />
+  <project path="prebuilts/qemu-kernel" name="platform/prebuilts/qemu-kernel" revision="main" />
+  <project path="prebuilts/tools" name="platform/prebuilts/tools" revision="main" />
   <project path="sdk" name="platform/sdk" />
   <project path="tools/adt/eclipse" name="platform/tools/adt/eclipse" />
   <project path="tools/adt/idea" name="platform/tools/adt/idea" />
   <project path="tools/base" name="platform/tools/base" />
   <project path="tools/emulator" name="platform/tools/emulator" />
   <project path="tools/external/fat32lib" name="platform/tools/external/fat32lib" />
-  <project path="tools/external/gradle" name="platform/tools/external/gradle" revision="master"/>
+  <project path="tools/external/gradle" name="platform/tools/external/gradle" revision="main"/>
   <project path="tools/gpu/src/android.googlesource.com/platform/tools/gpu" name="platform/tools/gpu" groups="gpu" />
-  <project path="tools/gpu/src/github.com/go-gl-legacy/gl" name="platform/tools/external/go/src/github.com/go-gl-legacy/gl" revision="master" groups="gpu" />
-  <project path="tools/gpu/src/github.com/go-gl/glfw" name="platform/tools/external/go/src/github.com/go-gl/glfw" revision="master" groups="gpu" />
-  <project path="tools/gpu/src/github.com/golang/protobuf" name="platform/tools/external/go/src/github.com/golang/protobuf" revision="master" groups="gpu" />
-  <project path="tools/gpu/src/golang.org/x/net" name="platform/tools/external/go/src/golang.org/x/net" revision="master" groups="gpu" />
-  <project path="tools/gpu/src/golang.org/x/tools" name="platform/tools/external/go/src/golang.org/x/tools" revision="master" groups="gpu" />
+  <project path="tools/gpu/src/github.com/go-gl-legacy/gl" name="platform/tools/external/go/src/github.com/go-gl-legacy/gl" revision="main" groups="gpu" />
+  <project path="tools/gpu/src/github.com/go-gl/glfw" name="platform/tools/external/go/src/github.com/go-gl/glfw" revision="main" groups="gpu" />
+  <project path="tools/gpu/src/github.com/golang/protobuf" name="platform/tools/external/go/src/github.com/golang/protobuf" revision="main" groups="gpu" />
+  <project path="tools/gpu/src/golang.org/x/net" name="platform/tools/external/go/src/golang.org/x/net" revision="main" groups="gpu" />
+  <project path="tools/gpu/src/golang.org/x/tools" name="platform/tools/external/go/src/golang.org/x/tools" revision="main" groups="gpu" />
   <project path="tools/gradle" name="platform/tools/gradle" />
   <project path="tools/idea" name="platform/tools/idea" revision="idea14-1.3-dev" />
   <project path="tools/studio/google/cloud/testing" name="platform/tools/studio/google/cloud/testing" />