diff --git a/rln/Cargo.toml b/rln/Cargo.toml
index 5cb48b7..a4d206e 100644
--- a/rln/Cargo.toml
+++ b/rln/Cargo.toml
@@ -94,3 +94,7 @@ harness = false
 [[bench]]
 name = "poseidon_tree_benchmark"
 harness = false
+
+[[bench]]
+name = "serialize_benchmark"
+harness = false
diff --git a/rln/benches/serialize_benchmark.rs b/rln/benches/serialize_benchmark.rs
new file mode 100644
index 0000000..65bacda
--- /dev/null
+++ b/rln/benches/serialize_benchmark.rs
@@ -0,0 +1,37 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use rln::circuit::TEST_TREE_HEIGHT;
+use rln::protocol::*;
+
+pub fn rln_witness_benchmark(c: &mut Criterion) {
+    let rln_witness = random_rln_witness(TEST_TREE_HEIGHT);
+
+    c.bench_function("rln_witness::full_cycle", |b| {
+        b.iter(|| {
+            let ser = serialize_witness(&rln_witness).unwrap();
+            let (deser, _) = deserialize_witness(&ser).unwrap();
+            let rln_witness_json = rln_witness_to_json(&deser).unwrap();
+            let _ = rln_witness_from_json(rln_witness_json).unwrap();
+        })
+    });
+
+    c.bench_function("rln_witness::serialize_cycle", |b| {
+        b.iter(|| {
+            let ser = serialize_witness(&rln_witness).unwrap();
+            let _ = deserialize_witness(&ser).unwrap();
+        })
+    });
+
+    c.bench_function("rln_witness::json_cycle", |b| {
+        b.iter(|| {
+            let rln_witness_json = rln_witness_to_json(&rln_witness).unwrap();
+            let _ = rln_witness_from_json(rln_witness_json).unwrap();
+        })
+    });
+}
+
+criterion_group! {
+    name = benches;
+    config = Criterion::default().measurement_time(std::time::Duration::from_secs(10));
+    targets = rln_witness_benchmark
+}
+criterion_main!(benches);