diff --git a/Cargo.lock b/Cargo.lock
index 2ffccb27f67..a7c250f9a87 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1183,7 +1183,7 @@ dependencies = [
  "proc-macro2 1.0.24",
  "quote 1.0.2",
  "serde",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "syn",
 ]
 
@@ -1618,7 +1618,7 @@ name = "fallible"
 version = "0.0.1"
 dependencies = [
  "hashglobe",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
 ]
 
 [[package]]
@@ -2017,7 +2017,7 @@ dependencies = [
  "parking_lot 0.11.0",
  "range-alloc",
  "raw-window-handle",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "spirv_cross",
  "thunderdome",
  "winapi",
@@ -2039,7 +2039,7 @@ dependencies = [
  "log",
  "range-alloc",
  "raw-window-handle",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "spirv_cross",
  "winapi",
 ]
@@ -2076,7 +2076,7 @@ dependencies = [
  "parking_lot 0.11.0",
  "range-alloc",
  "raw-window-handle",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "spirv_cross",
  "storage-map",
 ]
@@ -2097,7 +2097,7 @@ dependencies = [
  "log",
  "objc",
  "raw-window-handle",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "winapi",
 ]
 
@@ -3290,7 +3290,7 @@ dependencies = [
  "log",
  "servo-egl",
  "simpleservo",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "webxr",
  "webxr-api",
 ]
@@ -3497,7 +3497,7 @@ dependencies = [
  "serde_bytes",
  "servo_arc",
  "smallbitvec",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "string_cache",
  "thin-slice",
  "time",
@@ -4287,7 +4287,7 @@ dependencies = [
  "cloudabi 0.0.3",
  "libc",
  "redox_syscall",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "winapi",
 ]
 
@@ -4302,7 +4302,7 @@ dependencies = [
  "instant",
  "libc",
  "redox_syscall",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "winapi",
 ]
 
@@ -5217,7 +5217,7 @@ dependencies = [
  "phf_codegen",
  "precomputed-hash",
  "servo_arc",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "thin-slice",
  "to_shmem",
  "to_shmem_derive",
@@ -5791,9 +5791,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.4.2"
+version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fbee7696b84bbf3d89a1c2eccff0850e3047ed46bfcd2e92c29a2d074d57e252"
+checksum = "ae524f056d7d770e174287294f562e95044c68e88dec909a00d2094805db9d75"
 dependencies = [
  "serde",
 ]
@@ -5976,7 +5976,7 @@ dependencies = [
  "servo_config",
  "servo_url",
  "smallbitvec",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "string_cache",
  "style_derive",
  "style_traits",
@@ -6306,7 +6306,7 @@ dependencies = [
  "cssparser",
  "servo_arc",
  "smallbitvec",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "string_cache",
  "thin-slice",
 ]
@@ -7060,7 +7060,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sig",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "svg_fmt",
  "time",
  "tracy-rs",
@@ -7180,7 +7180,7 @@ dependencies = [
  "parking_lot 0.11.0",
  "ron 0.6.0",
  "serde",
- "smallvec 1.4.2",
+ "smallvec 1.5.1",
  "thiserror",
  "tracing",
  "wgpu-types",
diff --git a/ports/libmlservo/Cargo.toml b/ports/libmlservo/Cargo.toml
index 00c38551d2e..a4b1bb7c168 100644
--- a/ports/libmlservo/Cargo.toml
+++ b/ports/libmlservo/Cargo.toml
@@ -23,6 +23,6 @@ libservo = { path = "../../components/servo", features = ["no_static_freetype"]
 log = "0.4"
 servo-egl = "0.2"
 simpleservo = { path = "../libsimpleservo/api", features = ["no_static_freetype"] }
-smallvec = "1.4"
+smallvec = "1.5"
 webxr = { git = "https://github.com/servo/webxr", features = ["ipc", "magicleap"] }
 webxr-api = { git = "https://github.com/servo/webxr", features = ["ipc"] }