diff --git a/rust/CHANGELOG.md b/rust/CHANGELOG.md
index b5bbaa1..6500459 100644
--- a/rust/CHANGELOG.md
+++ b/rust/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.4.0] - 2025-11-13
+
+### Changed
+- Update alloy-primitives to 1.3.0.
+
 ## [0.3.0] - 2025-10-30
 
 ### Changed
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 5d12074..58a98b1 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "balancer-maths-rust"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2021"
 description = "Balancer V3 mathematics library in Rust"
 license = "MIT"
@@ -9,7 +9,7 @@ repository = "https://github.com/balancer/balancer-maths"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-alloy-primitives = { version = "0.5", features = ["serde"] }
+alloy-primitives = { version = "1.3.0", features = ["serde"] }
 
 # Serialization - for data structures
 serde = { version = "1.0", features = ["derive"] }