diff --git a/Xargo.toml b/Xargo.toml
new file mode 100644
index 00000000..5be4b76e
--- /dev/null
+++ b/Xargo.toml
@@ -0,0 +1,6 @@
+[dependencies.core]
+stage = 0
+
+[dependencies.compiler_builtins]
+features = ["mem"]
+stage = 1