diff --git a/CHANGELOG.md b/CHANGELOG.md
index f267740..b65d9b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## Unreleased
+
+- Update `pyo3` to 0.28.
+
 ## 0.27.0 - 2025-11-07
 - Update to PyO3 0.27
 
diff --git a/Cargo.toml b/Cargo.toml
index 4a714a3..36f7fb8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,11 +13,11 @@ documentation = "https://docs.rs/crate/pythonize/"
 
 [dependencies]
 serde = { version = "1.0", default-features = false, features = ["std"] }
-pyo3 = { version = "0.27", default-features = false }
+pyo3 = { version = "0.28", default-features = false }
 
 [dev-dependencies]
 serde = { version = "1.0", default-features = false, features = ["derive"] }
-pyo3 = { version = "0.27", default-features = false, features = ["auto-initialize", "macros", "py-clone"] }
+pyo3 = { version = "0.28", default-features = false, features = ["auto-initialize", "macros", "py-clone"] }
 serde_json = "1.0"
 serde_bytes = "0.11"
 maplit = "1.0.2"