diff --git a/rust-toolchain b/rust-toolchain
index 4439ba166b4..d2086be1386 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "nightly-2023-09-15"
+channel = "nightly-2024-01-15"
 components = [ "rustc-dev", "llvm-tools-preview", "rust-std", "rustfmt", "clippy" ]
 profile = "minimal"
diff --git a/viper-toolchain b/viper-toolchain
index ced0143ddf2..402615934d6 100644
--- a/viper-toolchain
+++ b/viper-toolchain
@@ -1 +1 @@
-v-2023-08-26-2125
+v-2023-12-16-1716