diff --git a/rust_book/c02-guessing_game/Cargo.lock b/rust_book/c02-guessing_game/Cargo.lock
index 8aec969..1d75403 100644
--- a/rust_book/c02-guessing_game/Cargo.lock
+++ b/rust_book/c02-guessing_game/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "c02-guessing_game"
@@ -40,14 +40,13 @@ checksum = "ed0cfbc8191465bed66e1718596ee0b0b35d5ee1f41c5df2189d0fe8bde535ba"
 
 [[package]]
 name = "rand"
-version = "0.8.4"
+version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8"
+checksum = "5ca0ecfa931c29007047d1bc58e623ab12e5590e8c7cc53200d5202b69266d8a"
 dependencies = [
  "libc",
  "rand_chacha",
  "rand_core",
- "rand_hc",
 ]
 
 [[package]]
@@ -69,15 +68,6 @@ dependencies = [
  "getrandom",
 ]
 
-[[package]]
-name = "rand_hc"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d51e9f596de227fda2ea6c84607f5558e196eeaf43c986b724ba4fb8fdf497e7"
-dependencies = [
- "rand_core",
-]
-
 [[package]]
 name = "wasi"
 version = "0.10.2+wasi-snapshot-preview1"
diff --git a/rust_book/c02-guessing_game/Cargo.toml b/rust_book/c02-guessing_game/Cargo.toml
index b33a7e3..2f4b20e 100644
--- a/rust_book/c02-guessing_game/Cargo.toml
+++ b/rust_book/c02-guessing_game/Cargo.toml
@@ -6,4 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rand = "0.8.3"
+rand = "0.8.6"