diff --git a/src/Php/ComposerPhpVersionFactory.php b/src/Php/ComposerPhpVersionFactory.php
index 924bfde5db..c9af575661 100644
--- a/src/Php/ComposerPhpVersionFactory.php
+++ b/src/Php/ComposerPhpVersionFactory.php
@@ -2,8 +2,6 @@
 
 namespace PHPStan\Php;
 
-use Composer\Semver\VersionParser;
-use Nette\Utils\Strings;
 use PHPStan\DependencyInjection\AutowiredParameter;
 use PHPStan\DependencyInjection\AutowiredService;
 use PHPStan\Internal\ComposerHelper;
@@ -11,7 +9,6 @@
 use function end;
 use function is_string;
 use function min;
-use function sprintf;
 
 #[AutowiredService]
 final class ComposerPhpVersionFactory
@@ -46,21 +43,26 @@ private function initializeVersions(): void
 			return;
 		}
 
-		$parser = new VersionParser();
-		$constraint = $parser->parseConstraints($composerPhpVersion);
-
-		if (!$constraint->getLowerBound()->isZero()) {
-			$minVersion = $this->buildVersion($constraint->getLowerBound()->getVersion(), false);
-
-			if ($minVersion !== null) {
-				$this->minVersion = new PhpVersion($minVersion->getVersionId());
+		$parser = new ComposerPhpVersionParser();
+		[$minVersion, $maxVersion] = $parser->parse($composerPhpVersion, static function (string $version, int $versionId, bool $isMaxVersion): PhpVersion {
+			if ($isMaxVersion && $version === '6.0.0.0-dev') {
+				$versionId = min($versionId, PhpVersionFactory::MAX_PHP5_VERSION);
+			} elseif ($isMaxVersion && $version === '8.0.0.0-dev') {
+				$versionId = min($versionId, PhpVersionFactory::MAX_PHP7_VERSION);
+			} else {
+				$versionId = min($versionId, PhpVersionFactory::MAX_PHP_VERSION);
 			}
+
+			return new PhpVersion($versionId);
+		});
+		if ($minVersion !== null) {
+			$this->minVersion = new PhpVersion($minVersion->getVersionId());
 		}
-		if ($constraint->getUpperBound()->isPositiveInfinity()) {
+		if ($maxVersion === null) {
 			return;
 		}
 
-		$this->maxVersion = $this->buildVersion($constraint->getUpperBound()->getVersion(), true);
+		$this->maxVersion = $maxVersion;
 	}
 
 	public function getMinVersion(): ?PhpVersion
@@ -99,27 +101,4 @@ private function getComposerRequireVersion(): ?string
 		return $composerPhpVersion;
 	}
 
-	private function buildVersion(string $version, bool $isMaxVersion): ?PhpVersion
-	{
-		$matches = Strings::match($version, '#^(\d+)\.(\d+)(?:\.(\d+))?#');
-		if ($matches === null) {
-			return null;
-		}
-
-		$major = $matches[1];
-		$minor = $matches[2];
-		$patch = $matches[3] ?? 0;
-		$versionId = (int) sprintf('%d%02d%02d', $major, $minor, $patch);
-
-		if ($isMaxVersion && $version === '6.0.0.0-dev') {
-			$versionId = min($versionId, PhpVersionFactory::MAX_PHP5_VERSION);
-		} elseif ($isMaxVersion && $version === '8.0.0.0-dev') {
-			$versionId = min($versionId, PhpVersionFactory::MAX_PHP7_VERSION);
-		} else {
-			$versionId = min($versionId, PhpVersionFactory::MAX_PHP_VERSION);
-		}
-
-		return new PhpVersion($versionId);
-	}
-
 }
diff --git a/src/Php/ComposerPhpVersionParser.php b/src/Php/ComposerPhpVersionParser.php
new file mode 100644
index 0000000000..6634c2b729
--- /dev/null
+++ b/src/Php/ComposerPhpVersionParser.php
@@ -0,0 +1,53 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Php;
+
+use Composer\Semver\VersionParser;
+use Nette\Utils\Strings;
+use function sprintf;
+
+final class ComposerPhpVersionParser
+{
+
+	/**
+	 * @param callable(string, int, bool):PhpVersion $buildPhpVersion
+	 *
+	 * @return array{PhpVersion|null, PhpVersion|null}
+	 */
+	public function parse(string $version, callable $buildPhpVersion): array
+	{
+		$minVersion = null;
+
+		$parser = new VersionParser();
+		$constraint = $parser->parseConstraints($version);
+
+		if (!$constraint->getLowerBound()->isZero()) {
+			$minVersion = $this->buildVersion($constraint->getLowerBound()->getVersion(), false, $buildPhpVersion);
+		}
+		if ($constraint->getUpperBound()->isPositiveInfinity()) {
+			return [ $minVersion, null ];
+		}
+
+		$maxVersion = $this->buildVersion($constraint->getUpperBound()->getVersion(), true, $buildPhpVersion);
+		return [ $minVersion, $maxVersion ];
+	}
+
+	/**
+	 * @param callable(string, int, bool):PhpVersion $buildPhpVersion
+	 */
+	private function buildVersion(string $version, bool $isMaxVersion, callable $buildPhpVersion): ?PhpVersion
+	{
+		$matches = Strings::match($version, '#^(\d+)\.(\d+)(?:\.(\d+))?#');
+		if ($matches === null) {
+			return null;
+		}
+
+		$major = $matches[1];
+		$minor = $matches[2];
+		$patch = $matches[3] ?? 0;
+		$versionId = (int) sprintf('%d%02d%02d', $major, $minor, $patch);
+
+		return $buildPhpVersion($version, $versionId, $isMaxVersion);
+	}
+
+}