diff --git a/Cargo.lock b/Cargo.lock
index e1ba4f066d..0d1465ddf5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -859,12 +859,6 @@ version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "349d5a591cd28b49e1d1037471617a32ddcda5731b99419008085f72d5a53836"
 
-[[package]]
-name = "linked-hash-map"
-version = "0.5.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fb9b38af92608140b86b693604b9ffcc5824240a484d1ecd4795bacb2fe88f3"
-
 [[package]]
 name = "linux-raw-sys"
 version = "0.0.46"
@@ -1456,14 +1450,15 @@ dependencies = [
 
 [[package]]
 name = "serde_yaml"
-version = "0.8.26"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578a7433b776b56a35785ed5ce9a7e777ac0598aac5a6dd1b4b18a307c7fc71b"
+checksum = "a35a3320a1c8ead0efb4bf508678e8dc29a1bd89118b2f9eae2dccb5123b1a69"
 dependencies = [
  "indexmap",
+ "itoa 1.0.2",
  "ryu",
  "serde",
- "yaml-rust",
+ "unsafe-libyaml",
 ]
 
 [[package]]
@@ -1709,6 +1704,12 @@ version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "957e51f3646910546462e67d5f7599b9e4fb8acdd304b087a6494730f9eebf04"
 
+[[package]]
+name = "unsafe-libyaml"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9dc1c637311091be28e5d462c07db78081e5828da80ba22605c81c4ad6f7f813"
+
 [[package]]
 name = "utf8parse"
 version = "0.2.0"
@@ -1894,15 +1895,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ae065fb2b24446a45c2bea0fe256b4ca54032661ee72d2500aaadeeec41b8e4e"
 
-[[package]]
-name = "yaml-rust"
-version = "0.4.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
-dependencies = [
- "linked-hash-map",
-]
-
 [[package]]
 name = "yoke"
 version = "0.5.0"
diff --git a/boa_tester/Cargo.toml b/boa_tester/Cargo.toml
index 892b599560..d695091092 100644
--- a/boa_tester/Cargo.toml
+++ b/boa_tester/Cargo.toml
@@ -17,7 +17,7 @@ boa_interner = { path = "../boa_interner", version = "0.15.0" }
 boa_gc = { path = "../boa_gc", version = "0.15.0" }
 structopt = "0.3.26"
 serde = { version = "1.0.140", features = ["derive"] }
-serde_yaml = "0.8.26"
+serde_yaml = "0.9.0"
 serde_json = "1.0.82"
 bitflags = "1.3.2"
 regex = "1.6.0"