diff --git a/src/Pattern/ProjectZomboid/DebugServerPattern.php b/src/Pattern/ProjectZomboid/DebugServerPattern.php
index bf9c95c..148cae9 100644
--- a/src/Pattern/ProjectZomboid/DebugServerPattern.php
+++ b/src/Pattern/ProjectZomboid/DebugServerPattern.php
@@ -15,7 +15,7 @@ namespace IndifferentKetchup\Codex\Pattern\ProjectZomboid;
  */
 class DebugServerPattern
 {
-    public const string LINE = '/^\[(\d{2}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3})\]\s+(\w+)\s*:\s+(\S+)\s+f:\d+,\s+t:\d+,\s+st:[\d,]+>\s+.*$/';
+    public const string LINE = '/^\[(\d{2}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3})\]\s+(\w+)\s*:\s+(\S+)\s+f:\d+(?:,\s+t:\d+)?,?\s+st:[\d,]+>\s+.*$/';
 
     public const string VERSION = '/version=(?<version>\S+) (?<hash>[a-f0-9]{40}) (?<date>\d{4}-\d{2}-\d{2}) (?<time>\d{2}:\d{2}:\d{2})/';
 
diff --git a/test/src/Games/ProjectZomboid/fixtures/debug-server-42x-minimal.txt b/test/src/Games/ProjectZomboid/fixtures/debug-server-42x-minimal.txt
new file mode 100644
index 0000000..f3c4af8
--- /dev/null
+++ b/test/src/Games/ProjectZomboid/fixtures/debug-server-42x-minimal.txt
@@ -0,0 +1,22 @@
+[16-04-26 00:00:42.314] LOG : General f:0 st:48,648,157,434> SLF4J(W): No SLF4J providers were found..
+[16-04-26 00:00:42.315] LOG : General f:0 st:48,648,157,492> SLF4J(W): Defaulting to no-operation (NOP) logger implementation.
+[16-04-26 00:00:42.407] LOG : General f:0 st:48,648,157,584> version=42.17.0 0000000000000000000000000000000000000000 2026-04-20 14:34:44 (ZB) demo=false.
+[16-04-26 00:00:42.407] LOG : General f:0 st:48,648,157,585> revision=0000000000000000000000000000000000000000 date=2026-04-20 time=14:34:44 (ZB).
+[16-04-26 00:01:19.080] ERROR: General f:0 st:48,648,194,258> DebugFileWatcher.registerDir> Exception thrown
+	java.nio.file.NoSuchFileException: /placeholder/config/mods at UnixException.translateToIOException(null:-1).
+	Stack trace:
+		java.base/sun.nio.fs.UnixException.translateToIOException(Unknown Source)
+		java.base/sun.nio.fs.UnixException.asIOException(Unknown Source)
+		java.base/sun.nio.fs.LinuxWatchService$Poller.implRegister(Unknown Source)
+		java.base/sun.nio.fs.AbstractPoller.processRequests(Unknown Source)
+		java.base/sun.nio.fs.LinuxWatchService$Poller.run(Unknown Source)
+[16-04-26 00:01:19.131] LOG : Mod f:0 st:48,648,194,309> loading example_mod_alpha.
+[16-04-26 00:01:19.142] LOG : Mod f:0 st:48,648,194,320> loading example_mod_beta.
+[16-04-26 00:01:19.155] LOG : Mod f:0 st:48,648,194,333> loading example_mod_gamma.
+[16-04-26 00:01:19.200] WARN : Mod f:0 st:48,648,194,378> ZomboidFileSystem.loadModAndRequired> required mod "absent_mod" not found.
+[16-04-26 00:01:45.937] ERROR: WorldGen f:0 st:48,648,221,115> IsoPropertyType.lookupOrDefaultStr> Exception thrown
+	zombie.core.properties.IsoPropertyType$IsoPropertyTypeNotFoundException: Property Name not found: ladderW at IsoPropertyType.lookup(IsoPropertyType.java:269). Message: Property Name not found: ladderW
+		at zombie.core.properties.IsoPropertyType.lookup(IsoPropertyType.java:269)
+		at zombie.iso.IsoChunkData.PostProcessChunk(IsoChunkData.java:512)
+[16-04-26 00:02:00.000] LOG : General f:0 st:48,648,235,178> server initialised.
+[16-04-26 00:05:00.000] LOG : General f:0 st:48,648,415,178> shutdown requested.
diff --git a/test/tests/Games/ProjectZomboid/Log/ProjectZomboidServerLogTest.php b/test/tests/Games/ProjectZomboid/Log/ProjectZomboidServerLogTest.php
index e76ca45..68f53a3 100644
--- a/test/tests/Games/ProjectZomboid/Log/ProjectZomboidServerLogTest.php
+++ b/test/tests/Games/ProjectZomboid/Log/ProjectZomboidServerLogTest.php
@@ -6,18 +6,31 @@ use IndifferentKetchup\Codex\Detective\Detective;
 use IndifferentKetchup\Codex\Log\File\PathLogFile;
 use IndifferentKetchup\Codex\Log\Level;
 use IndifferentKetchup\Codex\Log\ProjectZomboid\ProjectZomboidServerLog;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ProjectZomboidServerLogTest extends TestCase
 {
-    private function fixturePath(): string
+    /**
+     * Both PZ B41 and B42 line shapes must parse identically. B41 (and the
+     * fixture used by every analyser test) emits `f:N, t:N, st:N,N,N,N>`;
+     * B42 (release branch from 2026-04 onward, e.g. build 42.17) drops the
+     * `t:` microsecond field entirely and tightens whitespace to
+     * `f:N st:N,N,N,N>`.
+     */
+    public static function fixtureProvider(): array
     {
-        return __DIR__ . '/../../../../src/Games/ProjectZomboid/fixtures/debug-server-minimal.txt';
+        $base = __DIR__ . '/../../../../src/Games/ProjectZomboid/fixtures';
+        return [
+            'pz41-format' => [$base . '/debug-server-minimal.txt'],
+            'pz42-format' => [$base . '/debug-server-42x-minimal.txt'],
+        ];
     }
 
-    public function testParsesEntriesWithLevelAndPrefix(): void
+    #[DataProvider('fixtureProvider')]
+    public function testParsesEntriesWithLevelAndPrefix(string $fixturePath): void
     {
-        $log = (new ProjectZomboidServerLog())->setLogFile(new PathLogFile($this->fixturePath()));
+        $log = (new ProjectZomboidServerLog())->setLogFile(new PathLogFile($fixturePath));
         $log->parse();
 
         $entries = $log->getEntries();
@@ -29,9 +42,10 @@ class ProjectZomboidServerLogTest extends TestCase
         $this->assertNotNull($first->getTime());
     }
 
-    public function testStackTraceLinesAttachToTriggeringErrorEntry(): void
+    #[DataProvider('fixtureProvider')]
+    public function testStackTraceLinesAttachToTriggeringErrorEntry(string $fixturePath): void
     {
-        $log = (new ProjectZomboidServerLog())->setLogFile(new PathLogFile($this->fixturePath()));
+        $log = (new ProjectZomboidServerLog())->setLogFile(new PathLogFile($fixturePath));
         $log->parse();
 
         $errorEntry = null;
@@ -46,19 +60,21 @@ class ProjectZomboidServerLogTest extends TestCase
         $this->assertGreaterThan(1, count($errorEntry->getLines()));
     }
 
-    public function testWarnLevelMapsCorrectly(): void
+    #[DataProvider('fixtureProvider')]
+    public function testWarnLevelMapsCorrectly(string $fixturePath): void
     {
-        $log = (new ProjectZomboidServerLog())->setLogFile(new PathLogFile($this->fixturePath()));
+        $log = (new ProjectZomboidServerLog())->setLogFile(new PathLogFile($fixturePath));
         $log->parse();
 
         $warnEntries = array_filter($log->getEntries(), fn($e) => $e->getLevel() === Level::WARNING);
         $this->assertNotEmpty($warnEntries);
     }
 
-    public function testDetectiveDispatchesByContent(): void
+    #[DataProvider('fixtureProvider')]
+    public function testDetectiveDispatchesByContent(string $fixturePath): void
     {
         $detective = (new Detective())
-            ->setLogFile(new PathLogFile($this->fixturePath()))
+            ->setLogFile(new PathLogFile($fixturePath))
             ->addPossibleLogClass(ProjectZomboidServerLog::class);
 
         $log = $detective->detect();