diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2d8626..99c2222 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - Enh #131: Throw `InvalidArgumentException` when missed "one" plural key (@vjik) 
 - Bug #132: Fix incorrect locale usage when category source is not exist and specified fallback locale (@vjik)
+- Bug #148: Fix the nullable parameter declarations for compatibility with PHP 8.4 (@martio)
 
 ## 3.0.0 February 17, 2023
 
diff --git a/src/Translator.php b/src/Translator.php
index 880f98d..f496f08 100644
--- a/src/Translator.php
+++ b/src/Translator.php
@@ -72,8 +72,8 @@ public function getLocale(): string
     public function translate(
         string|Stringable $id,
         array $parameters = [],
-        string $category = null,
-        string $locale = null
+        ?string $category = null,
+        ?string $locale = null
     ): string {
         $locale ??= $this->locale;
 
diff --git a/src/TranslatorInterface.php b/src/TranslatorInterface.php
index 3a4242b..5adcdc3 100644
--- a/src/TranslatorInterface.php
+++ b/src/TranslatorInterface.php
@@ -46,8 +46,8 @@ public function getLocale(): string;
     public function translate(
         string|Stringable $id,
         array $parameters = [],
-        string $category = null,
-        string $locale = null
+        ?string $category = null,
+        ?string $locale = null
     ): string;
 
     /**