diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 000000000..c4bd27c80
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,9 @@
+[toolchain]
+# Anything in the latest stable version of rust is fine to use.
+channel = "stable"
+targets = [
+    "x86_64-apple-darwin",
+    "x86_64-pc-windows-gnu",
+    "x86_64-pc-windows-msvc",
+    "x86_64-unknown-linux-gnu",
+]