diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000000..add0516c3c
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,8 @@
+# https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file
+[toolchain]
+# can be further pinned eg:
+# date: "stable-2020-07-10"
+# version: "nightly-1.0.0"
+channel = "stable"
+components = [ "rustfmt", "rust-src", "clippy", "rust-analysis"]
+targets = [ "wasm32-wasi" ]