diff --git a/src/Standards/PSR12/Sniffs/Functions/NullableTypeDeclarationSniff.php b/src/Standards/PSR12/Sniffs/Functions/NullableTypeDeclarationSniff.php
index 3f18a82179..ac0775d13e 100644
--- a/src/Standards/PSR12/Sniffs/Functions/NullableTypeDeclarationSniff.php
+++ b/src/Standards/PSR12/Sniffs/Functions/NullableTypeDeclarationSniff.php
@@ -27,6 +27,9 @@ class NullableTypeDeclarationSniff implements Sniff
         T_SELF         => true,
         T_PARENT       => true,
         T_STATIC       => true,
+        T_NULL         => true,
+        T_FALSE        => true,
+        T_TRUE         => true,
     ];
 
 
diff --git a/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.inc b/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.inc
index e3a5a775f2..056d74c3f2 100644
--- a/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.inc
+++ b/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.inc
@@ -85,3 +85,11 @@ class testInstanceOf() {
 
 // PHP 8.0: static return type.
 function testStatic() : ? static {}
+
+// PHP 8.2: nullable true/false.
+function fooG(): ? true {}
+function fooH(): ?
+     false {}
+
+// Fatal error: null cannot be marked as nullable, but that's not the concern of this sniff.
+function fooI(): ? null {}
diff --git a/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.inc.fixed b/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.inc.fixed
index 6225d1b337..6cc418d074 100644
--- a/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.inc.fixed
+++ b/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.inc.fixed
@@ -83,3 +83,10 @@ class testInstanceOf() {
 
 // PHP 8.0: static return type.
 function testStatic() : ?static {}
+
+// PHP 8.2: nullable true/false.
+function fooG(): ?true {}
+function fooH(): ?false {}
+
+// Fatal error: null cannot be marked as nullable, but that's not the concern of this sniff.
+function fooI(): ?null {}
diff --git a/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.php b/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.php
index b4905d3650..da11498ad1 100644
--- a/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.php
+++ b/src/Standards/PSR12/Tests/Functions/NullableTypeDeclarationUnitTest.php
@@ -41,6 +41,9 @@ protected function getErrorList()
             58 => 2,
             59 => 2,
             87 => 1,
+            90 => 1,
+            91 => 1,
+            95 => 1,
         ];
 
     }//end getErrorList()