diff --git a/complete_blockchain/Cargo.lock b/complete_blockchain/Cargo.lock
index 699a6ae..55a5acc 100644
--- a/complete_blockchain/Cargo.lock
+++ b/complete_blockchain/Cargo.lock
@@ -95,9 +95,9 @@ checksum = "771fe0050b883fcc3ea2359b1a96bcfbc090b7116eae7c3c512c7a083fdf23d3"
 
 [[package]]
 name = "bumpalo"
-version = "3.8.0"
+version = "3.15.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f1e260c3a9040a7c19a12468758f4c16f31a81a1fe087482be9570ec864bb6c"
+checksum = "7ff69b9dd49fd426c69a0db9fc04dd934cdb6645ff000864d98f7e2af8830eaa"
 
 [[package]]
 name = "byteorder"