diff --git a/Cargo.lock b/Cargo.lock
index 9a11985cc1..53cd1e3a87 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3681,9 +3681,9 @@ dependencies = [
 
 [[package]]
 name = "serde_yaml"
-version = "0.9.19"
+version = "0.9.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f82e6c8c047aa50a7328632d067bcae6ef38772a79e28daf32f735e0e4f3dd10"
+checksum = "d9d684e3ec7de3bf5466b32bd75303ac16f0736426e5a4e0d6e489559ce1249c"
 dependencies = [
  "indexmap",
  "itoa",
diff --git a/boa_tester/Cargo.toml b/boa_tester/Cargo.toml
index b0022031cd..a59275cefb 100644
--- a/boa_tester/Cargo.toml
+++ b/boa_tester/Cargo.toml
@@ -16,7 +16,7 @@ boa_engine = { workspace = true, features = ["annex-b"] }
 boa_gc.workspace = true
 clap = { version = "4.2.1", features = ["derive"] }
 serde = { version = "1.0.159", features = ["derive"] }
-serde_yaml = "0.9.19"
+serde_yaml = "0.9.21"
 serde_json = "1.0.95"
 bitflags = "2.1.0"
 regex = "1.7.3"