diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..37e09e5
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "nightly"
+components = [ "rustfmt", "rust-src" ]
+targets = [ "wasm32-unknown-unknown" ]