diff --git a/build.sh b/build.sh
index a4b134d9a6..524e475d58 100755
--- a/build.sh
+++ b/build.sh
@@ -27,4 +27,7 @@ if test ! -d packages/KoreBuild; then
     mono .nuget/nuget.exe install Sake -version 0.2 -o packages -ExcludeVersion
 fi
 
+. build/kvm.sh
+kvm upgrade
+
 mono packages/Sake/tools/Sake.exe -I packages/KoreBuild/build -f makefile.shade "$@"