diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 000000000..c70d75900
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,3 @@
+[toolchain]
+# Keep in sync with versions.yaml
+channel = "1.80.0"
diff --git a/versions.yaml b/versions.yaml
index 5d2e2887e..a0f810a22 100644
--- a/versions.yaml
+++ b/versions.yaml
@@ -392,6 +392,7 @@ languages:
   rust:
     description: "Rust language"
     notes: "'version' is the default minimum version used by this project."
+    # Keep in sync with rust-toolchain.toml
     version: "1.80.0"
     meta:
       description: |