diff --git a/src/Event/Emitter/Emitter.php b/src/Event/Emitter/Emitter.php
index 9204ac98534..ec34561de12 100644
--- a/src/Event/Emitter/Emitter.php
+++ b/src/Event/Emitter/Emitter.php
@@ -145,9 +145,6 @@ public function testConsideredRisky(Code\Test $test, string $message): void;
 
     public function testMarkedAsIncomplete(Code\Test $test, Throwable $throwable): void;
 
-    /**
-     * @param non-empty-string $message
-     */
     public function testSkipped(Code\Test $test, string $message): void;
 
     /**
diff --git a/src/Framework/MockObject/Generator/HookedPropertyGenerator.php b/src/Framework/MockObject/Generator/HookedPropertyGenerator.php
index 8da519e4990..2ae770d6037 100644
--- a/src/Framework/MockObject/Generator/HookedPropertyGenerator.php
+++ b/src/Framework/MockObject/Generator/HookedPropertyGenerator.php
@@ -22,7 +22,7 @@ final class HookedPropertyGenerator
      * @param class-string         $className
      * @param list<HookedProperty> $properties
      *
-     * @return non-empty-string
+     * @return string
      */
     public function generate(string $className, array $properties): string
     {
diff --git a/src/Framework/TestBuilder.php b/src/Framework/TestBuilder.php
index 5c3effc7a35..3444a435dbc 100644
--- a/src/Framework/TestBuilder.php
+++ b/src/Framework/TestBuilder.php
@@ -76,7 +76,7 @@ public function build(ReflectionClass $theClass, string $methodName, array $grou
     /**
      * @param non-empty-string                                                                                                                                                  $methodName
      * @param class-string<TestCase>                                                                                                                                            $className
-     * @param array<list<mixed>>                                                                                                                                                $data
+     * @param array<array<mixed>>                                                                                                                                                $data
      * @param array{backupGlobals: ?bool, backupGlobalsExcludeList: list<string>, backupStaticProperties: ?bool, backupStaticPropertiesExcludeList: array<string,list<string>>} $backupSettings
      * @param list<non-empty-string>                                                                                                                                            $groups
      */
diff --git a/src/Framework/TestCase.php b/src/Framework/TestCase.php
index 43305f7c137..dffa70cb479 100644
--- a/src/Framework/TestCase.php
+++ b/src/Framework/TestCase.php
@@ -389,6 +389,8 @@ final public function size(): TestSize
 
     /**
      * @internal This method is not covered by the backward compatibility promise for PHPUnit
+     *
+     * @phpstan-assert-if-true non-empty-string $this->output()
      */
     final public function hasUnexpectedOutput(): bool
     {
diff --git a/src/Logging/EventLogger.php b/src/Logging/EventLogger.php
index e7f029af914..ab3a30c2fed 100644
--- a/src/Logging/EventLogger.php
+++ b/src/Logging/EventLogger.php
@@ -41,7 +41,7 @@ public function trace(Event $event): void
     {
         $telemetryInfo = $this->telemetryInfo($event);
         $indentation   = PHP_EOL . str_repeat(' ', strlen($telemetryInfo));
-        $lines         = preg_split('/\r\n|\r|\n/', $event->asString());
+        $lines         = preg_split('/\r\n|\r|\n/', $event->asString()) ?: [];
 
         $flags = FILE_APPEND;
 
diff --git a/src/Logging/JUnit/JunitXmlLogger.php b/src/Logging/JUnit/JunitXmlLogger.php
index 2eae77ac6de..262872a7ea1 100644
--- a/src/Logging/JUnit/JunitXmlLogger.php
+++ b/src/Logging/JUnit/JunitXmlLogger.php
@@ -102,7 +102,7 @@ public function __construct(Printer $printer, Facade $facade)
 
     public function flush(): void
     {
-        $this->printer->print($this->document->saveXML());
+        $this->printer->print($this->document->saveXML() ?: '');
 
         $this->printer->flush();
     }
@@ -269,7 +269,7 @@ private function handleFinish(Info $telemetryInfo, int $numberOfAssertionsPerfor
         );
 
         $this->testSuiteTests[$this->testSuiteLevel]++;
-        $this->testSuiteTimes[$this->testSuiteLevel] += $time;
+        $this->testSuiteTimes[$this->testSuiteLevel] += (int) $time;
 
         $this->currentTestCase = null;
         $this->time            = null;
diff --git a/src/Metadata/Api/Requirements.php b/src/Metadata/Api/Requirements.php
index b29c45f0b99..32ec095cd99 100644
--- a/src/Metadata/Api/Requirements.php
+++ b/src/Metadata/Api/Requirements.php
@@ -72,7 +72,7 @@ public function requirementsNotSatisfiedFor(string $className, string $methodNam
 
                 if (!extension_loaded($metadata->extension()) ||
                     ($metadata->hasVersionRequirement() &&
-                        !$metadata->versionRequirement()->isSatisfiedBy(phpversion($metadata->extension())))) {
+                        !$metadata->versionRequirement()->isSatisfiedBy(phpversion($metadata->extension()) ?: ''))) {
                     $notSatisfied[] = sprintf(
                         'PHP extension %s%s is required.',
                         $metadata->extension(),
diff --git a/src/Metadata/CoversClassesThatExtendClass.php b/src/Metadata/CoversClassesThatExtendClass.php
index abe524a4dd5..cd677debf2c 100644
--- a/src/Metadata/CoversClassesThatExtendClass.php
+++ b/src/Metadata/CoversClassesThatExtendClass.php
@@ -23,6 +23,7 @@
 
     /**
      * @param 0|1 $level
+     * @param class-string $className
      */
     protected function __construct(int $level, string $className)
     {
diff --git a/src/Metadata/Version/Requirement.php b/src/Metadata/Version/Requirement.php
index 391ccdec55f..73c64f55a53 100644
--- a/src/Metadata/Version/Requirement.php
+++ b/src/Metadata/Version/Requirement.php
@@ -23,7 +23,7 @@
  */
 abstract readonly class Requirement
 {
-    private const VERSION_COMPARISON = '/(?P<operator>[<>=!]{0,2})\s*(?P<version>[\d\.-]+(dev|(RC|alpha|beta)[\d\.])?)[ \t]*\r?$/m';
+    private const VERSION_COMPARISON = "/(?P<operator>!=|<|<=|<>|=|==|>|>=)\s*(?P<version>[\d\.-]+(dev|(RC|alpha|beta)[\d\.])?)[ \t]*\r?$/m";
 
     /**
      * @throws InvalidVersionOperatorException
@@ -41,9 +41,7 @@ public static function from(string $versionRequirement): self
             if (preg_match(self::VERSION_COMPARISON, $versionRequirement, $matches)) {
                 return new ComparisonRequirement(
                     $matches['version'],
-                    new VersionComparisonOperator(
-                        !empty($matches['operator']) ? $matches['operator'] : '>=',
-                    ),
+                    new VersionComparisonOperator($matches['operator']),
                 );
             }
         }