diff --git a/changelog.txt b/changelog.txt
index fd474440a98f2308b5b90d105621ec6fab185b24..a5b85e1695fee67057b7e876bd2bc8af8be8d409 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,8 +1,13 @@
 # Changelog
 
-## [3.3.0] - 2025-04-XX
+## [4.0.0] - 2025-04-XX
 ### Added
 - ToggleField class, extends CheckboxField for toggle button functionality.
+### Changed
+- Declared nullable parameter types (e.g. `?string`, `?Renderer`) to fix PHP 8.4 deprecation warnings about implicitly nullable parameters.
+### Removed
+- Support for PHP < 7.1.
+
 
 ## [3.2.1] - 2024-10-30
 ### Changed