diff --git a/exercises/4-multitasking/3-asynchronous-multitasking/2-async-chat/Cargo.lock b/exercises/4-multitasking/3-asynchronous-multitasking/2-async-chat/Cargo.lock
index 78eeb17..d6aedbe 100644
--- a/exercises/4-multitasking/3-asynchronous-multitasking/2-async-chat/Cargo.lock
+++ b/exercises/4-multitasking/3-asynchronous-multitasking/2-async-chat/Cargo.lock
@@ -266,11 +266,12 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.115"
+version = "1.0.125"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12dc5c46daa8e9fdf4f5e71b6cf9a53f2487da0e86e55808e2d35539666497dd"
+checksum = "83c8e735a073ccf5be70aa8066aa984eaf2fa000db6c8d0100ae605b366d31ed"
 dependencies = [
  "itoa",
+ "memchr",
  "ryu",
  "serde",
 ]
diff --git a/exercises/4-multitasking/3-asynchronous-multitasking/2-async-chat/Cargo.toml b/exercises/4-multitasking/3-asynchronous-multitasking/2-async-chat/Cargo.toml
index cc3ce31..cd088ac 100644
--- a/exercises/4-multitasking/3-asynchronous-multitasking/2-async-chat/Cargo.toml
+++ b/exercises/4-multitasking/3-asynchronous-multitasking/2-async-chat/Cargo.toml
@@ -8,6 +8,6 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.70"
 serde = { version = "1.0.159", features = ["derive"] }
-serde_json = "1.0.95"
+serde_json = "1.0.125"
 tokio = { version = "1.27.0", features = ["full"] }
 tokio-stream = { version = "0.1.12", features = ["sync"] }