diff --git a/lib/CHANGELOG.md b/lib/CHANGELOG.md
index 04b3a4e..4a15831 100644
--- a/lib/CHANGELOG.md
+++ b/lib/CHANGELOG.md
@@ -1,3 +1,6 @@
+# celeste_rs/0.4.0 - 2024-07-20
+- Fix bug where `AmbienceVolume` can be non-null
+
 # celeste_rs/0.3.0 - 2024-06-04
 - Add support for `modsave`, `modsession`, and `modsetting` file parsing
 - Add support for `x-AurorasAdditions-modsave` files
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index 2cd7a45..98eaaab 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "celeste_rs"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2021"
 repository = "https://github.com/maddymakesgames/celeste_rs"
 authors = ["Maddymakesgames (madelinemakesgames@gmail.com)"]