diff --git a/composer.json b/composer.json
index 10496a7..4e2f230 100644
--- a/composer.json
+++ b/composer.json
@@ -33,8 +33,7 @@
 	],
 	"require": {
 		"php": ">=8.3.36",
-		"phpbb/phpbb": ">=3.3.19 <4.1.0",
-		"composer/installers": "~2.0"
+		"composer/installers": "^1.0 || ^2.0"
 	},
 	"extra": {
 		"display-name": "Knowledge Base",
diff --git a/tests/kb_declared_support_test.php b/tests/kb_declared_support_test.php
index eb3150d..e2ad419 100644
--- a/tests/kb_declared_support_test.php
+++ b/tests/kb_declared_support_test.php
@@ -86,16 +86,16 @@ public function test_the_ci_matrix_starts_at_the_declared_minimum()
 		$this->assertContains($primary[1], $versions);
 	}
 
-	public function test_the_phpbb_requirement_and_soft_requirement_agree_and_state_the_same_minimum_as_ext_php()
+	public function test_phpbb_is_only_a_soft_requirement_stating_the_same_minimum_as_ext_php()
 	{
 		$composer = $this->composer();
-		$hard = $composer['require']['phpbb/phpbb'];
 		$soft = $composer['extra']['soft-require']['phpbb/phpbb'];
 
-		$this->assertSame('>=' . ext::MIN_PHPBB_VERSION, explode(' ', $hard)[0]);
+		// phpBB belongs only in extra.soft-require, which Composer ignores; under require, Composer would
+		// try to resolve phpBB itself.
+		$this->assertArrayNotHasKey('phpbb/phpbb', $composer['require']);
 		$this->assertSame('>=' . ext::MIN_PHPBB_VERSION, explode(',', $soft)[0]);
-		// Both caps allow phpBB 3.3.x and 4.0.x and stop at the same bound, so one cannot be changed without the other.
-		$this->assertSame('<4.1.0', explode(' ', $hard)[1]);
+		// The cap allows phpBB 3.3.x and 4.0.x.
 		$this->assertSame('<4.1.0@dev', explode(',', $soft)[1]);
 	}