diff --git a/Cargo.toml b/Cargo.toml
index 2ac8f9b..643e089 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -59,6 +59,7 @@ bson = { version = "2.6.0", git = "https://github.com/djkoloski/bson-rust", bran
 bytecheck = { version = "0.6.11", optional = true }
 bytemuck = { version = "1.14.0", optional = true }
 capnp = { version = "0.18.3", optional = true }
+cbor4ii = { version = "0.3.1", features = [ "use_std", "serde1" ], optional = true }
 ciborium = { version = "0.2.1", optional = true }
 criterion = "0.5"
 dlhn = { version = "0.1.6", optional = true }
@@ -100,6 +101,7 @@ default = [
   "bytecheck",
   "bytemuck",
   "capnp",
+  "cbor4ii",
   "ciborium",
   "dlhn",
   "flatbuffers",
diff --git a/benches/bench.rs b/benches/bench.rs
index 0c3cc70..318d699 100644
--- a/benches/bench.rs
+++ b/benches/bench.rs
@@ -14,6 +14,8 @@ use rust_serialization_benchmark::bench_borsh;
 use rust_serialization_benchmark::bench_bson;
 #[cfg(feature = "capnp")]
 use rust_serialization_benchmark::bench_capnp;
+#[cfg(feature = "cbor4ii")]
+use rust_serialization_benchmark::bench_cbor4ii;
 #[cfg(feature = "ciborium")]
 use rust_serialization_benchmark::bench_ciborium;
 #[cfg(feature = "dlhn")]
@@ -115,6 +117,9 @@ fn bench_log(c: &mut Criterion) {
         }
     });
 
+    #[cfg(feature = "cbor4ii")]
+    bench_cbor4ii::bench(BENCH, c, &data);
+
     #[cfg(feature = "ciborium")]
     bench_ciborium::bench(BENCH, c, &data);
 
@@ -278,6 +283,9 @@ fn bench_mesh(c: &mut Criterion) {
         }
     });
 
+    #[cfg(feature = "cbor4ii")]
+    bench_cbor4ii::bench(BENCH, c, &data);
+
     #[cfg(feature = "ciborium")]
     bench_ciborium::bench(BENCH, c, &data);
 
@@ -427,6 +435,9 @@ fn bench_minecraft_savedata(c: &mut Criterion) {
         }
     });
 
+    #[cfg(feature = "cbor4ii")]
+    bench_cbor4ii::bench(BENCH, c, &data);
+
     #[cfg(feature = "ciborium")]
     bench_ciborium::bench(BENCH, c, &data);
 
@@ -580,6 +591,9 @@ fn bench_mk48(c: &mut Criterion) {
         }
     });
 
+    #[cfg(feature = "cbor4ii")]
+    bench_cbor4ii::bench(BENCH, c, &data);
+
     #[cfg(feature = "ciborium")]
     bench_ciborium::bench(BENCH, c, &data);
 
diff --git a/src/bench_cbor4ii.rs b/src/bench_cbor4ii.rs
new file mode 100644
index 0000000..dee2782
--- /dev/null
+++ b/src/bench_cbor4ii.rs
@@ -0,0 +1,35 @@
+use criterion::{black_box, Criterion};
+use serde::{Deserialize, Serialize};
+
+pub fn bench<T>(name: &'static str, c: &mut Criterion, data: &T)
+where
+    T: Serialize + for<'de> Deserialize<'de>,
+{
+    const BUFFER_LEN: usize = 50_000_000;
+
+    let mut group = c.benchmark_group(format!("{}/cbor4ii", name));
+
+    let mut serialize_buffer = vec![0; BUFFER_LEN];
+    group.bench_function("serialize", |b| {
+        b.iter(|| {
+            serialize_buffer = cbor4ii::serde::to_vec(
+                std::mem::take(black_box(&mut serialize_buffer)),
+                black_box(&data),
+            )
+            .unwrap();
+            black_box(());
+        })
+    });
+
+    let deserialize_buffer = cbor4ii::serde::to_vec(Vec::new(), &data).unwrap();
+
+    group.bench_function("deserialize", |b| {
+        b.iter(|| {
+            black_box(cbor4ii::serde::from_slice::<'_, T>(black_box(&deserialize_buffer)).unwrap());
+        })
+    });
+
+    crate::bench_size(name, "cbor4ii", deserialize_buffer.as_slice());
+
+    group.finish();
+}
diff --git a/src/lib.rs b/src/lib.rs
index 08fca17..05e52a7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,6 +12,8 @@ pub mod bench_borsh;
 pub mod bench_bson;
 #[cfg(feature = "capnp")]
 pub mod bench_capnp;
+#[cfg(feature = "cbor4ii")]
+pub mod bench_cbor4ii;
 #[cfg(feature = "ciborium")]
 pub mod bench_ciborium;
 #[cfg(feature = "dlhn")]