diff --git a/rust-toolchain b/rust-toolchain
index fd472758d1c9e9ca75c8495618d013eb384f6709..c9f868225cd0e41691f64e500caea621da539468 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2021-10-15
+nightly-2021-12-15