diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3f9e366..e6170a7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,6 +28,19 @@ Released YYYY-MM-DD.
 
 --------------------------------------------------------------------------------
 
+## 3.16.0
+
+Released 2024-04-08.
+
+### Added
+
+* Added an optional, off-by-default dependency on the `serde` crate. Enabling
+  this dependency allows you to serialize Bumpalo's collection and box
+  types. Deserialization is not implemented, due to constraints of the
+  deserialization trait.
+
+--------------------------------------------------------------------------------
+
 ## 3.15.4
 
 Released 2024-03-07.
diff --git a/Cargo.toml b/Cargo.toml
index 02536ee..e77afcb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ license = "MIT OR Apache-2.0"
 name = "bumpalo"
 readme = "README.md"
 repository = "https://github.com/fitzgen/bumpalo"
-version = "3.15.4"
+version = "3.16.0"
 exclude = ["/.github/*", "/benches", "/tests", "valgrind.supp", "bumpalo.png"]
 rust-version = "1.73.0"
 
diff --git a/tests/all/serde.rs b/tests/all/serde.rs
index a37962c..6270095 100644
--- a/tests/all/serde.rs
+++ b/tests/all/serde.rs
@@ -6,7 +6,7 @@ use serde::{Deserialize, Serialize};
 
 macro_rules! compare_std_vec {
     (in $bump:ident; $($x:expr),+) => {{
-        let mut vec = vec![in &$bump; $($x),+];
+        let vec = vec![in &$bump; $($x),+];
         let std_vec = std::vec![$($x),+];
         (vec, std_vec)
     }}