diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index c03e698..6392e0a 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,5 +1,5 @@
 [toolchain]
-channel = "nightly-2024-01-01"
+channel = "nightly-2023-12-20"
 components = [ "rust-src", "rustfmt" ]
 targets = [
     "thumbv6m-none-eabi",