diff --git a/CHANGELOG.md b/CHANGELOG.md
index d47709b..19a88f1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,28 @@
 # Changelog
 
+## 0.9 (2024-01-12)
+
+### Added
+
+- `IntoSystem` trait, which allows systems which return `bool`, `Option`, or `Result`, and accept
+`Entity` or nothing as input, to be used as triggers
+- `TriggerIn` trait, which allows systems which accept nothing as input to be used as triggers
+- `TriggerOut` trait, which allows triggers to output `bool` or `Option` without `BoolTrigger` and
+`OptionTrigger`
+- `SystemTrigger` type, which is also used for system triggers
+
+### Changed
+
+- `trans` and `trans_builder` each have a new type parameter, which should simply be elided with `_`
+- Replaced all built-in trigger types with system equivalents
+- Renamed `MachineState` to `EntityState`
+- `Trigger` has an `Out` type and `init` and `check` functions, instead of `Param`, `Ok`, and `Err`
+types and a `trigger` function
+
+### Removed
+
+- `BoolTrigger` and `OptionTrigger`
+
 ## 0.8 (2023-11-12)
 
 ### Added
diff --git a/Cargo.toml b/Cargo.toml
index 4a8926a..fbce0ff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "seldom_state"
-version = "0.8.0"
+version = "0.9.0"
 edition = "2021"
 categories = [ "game-development" ]
 description = "Component-based state machine plugin for Bevy. Useful for AI, player state, and other entities that occupy various states."
diff --git a/README.md b/README.md
index 9160ef7..62254bb 100644
--- a/README.md
+++ b/README.md
@@ -149,7 +149,7 @@ See the `chase.rs` example for further usage.
 
 | Bevy | `leafwing-input-manager` | `seldom_state` |
 | ---- | ------------------------ | -------------- |
-| 0.12 | 0.11                     | 0.8            |
+| 0.12 | 0.11                     | 0.8 - 0.9      |
 | 0.11 | 0.10                     | 0.7            |
 | 0.10 | 0.9                      | 0.5 - 0.6      |
 | 0.9  | 0.8                      | 0.4            |