diff --git a/Cargo.lock b/Cargo.lock
index dc47c79..e2f9d78 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1045,19 +1045,6 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7144d30dcf0fafbce74250a3963025d8d52177934239851c917d29f1df280c2"
 
-[[package]]
-name = "contracts"
-version = "0.1.0"
-dependencies = [
- "eth-types",
- "ethers",
- "halo2-base",
- "halo2curves-axiom",
- "itertools 0.12.0",
- "lightclient-circuits",
- "ssz_rs",
-]
-
 [[package]]
 name = "convert_case"
 version = "0.4.0"
diff --git a/rust-toolchain b/rust-toolchain
index 6e8ed0e..9df1964 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2024-08-11
+nightly-2024-01-08