diff --git a/modules/core/src/main/scala/de/nowchess/chess/json/SquareDeserializer.scala b/modules/core/src/main/scala/de/nowchess/chess/json/SquareDeserializer.scala
index a14b84f..5641a8f 100644
--- a/modules/core/src/main/scala/de/nowchess/chess/json/SquareDeserializer.scala
+++ b/modules/core/src/main/scala/de/nowchess/chess/json/SquareDeserializer.scala
@@ -5,7 +5,5 @@ import com.fasterxml.jackson.databind.{DeserializationContext, JsonDeserializer}
 import de.nowchess.api.board.Square
 
 class SquareDeserializer extends JsonDeserializer[Square]:
-  // scalafix:off DisableSyntax.null
   override def deserialize(p: JsonParser, ctx: DeserializationContext): Square =
     Square.fromAlgebraic(p.getText).orNull
-  // scalafix:on DisableSyntax.null
diff --git a/modules/core/src/test/scala/de/nowchess/chess/registry/GameRegistryImplTest.scala b/modules/core/src/test/scala/de/nowchess/chess/registry/GameRegistryImplTest.scala
index f027e53..53d1362 100644
--- a/modules/core/src/test/scala/de/nowchess/chess/registry/GameRegistryImplTest.scala
+++ b/modules/core/src/test/scala/de/nowchess/chess/registry/GameRegistryImplTest.scala
@@ -21,14 +21,24 @@ class GameRegistryImplTest:
   @Test
   @DisplayName("store saves entry")
   def testStore(): Unit =
-    val entry = GameEntry("g1", GameEngine(ruleSet = DefaultRules), PlayerInfo(PlayerId("p1"), "P1"), PlayerInfo(PlayerId("p2"), "P2"))
+    val entry = GameEntry(
+      "g1",
+      GameEngine(ruleSet = DefaultRules),
+      PlayerInfo(PlayerId("p1"), "P1"),
+      PlayerInfo(PlayerId("p2"), "P2"),
+    )
     registry.store(entry)
     assertTrue(registry.get("g1").isDefined)
 
   @Test
   @DisplayName("get returns stored entry")
   def testGet(): Unit =
-    val entry = GameEntry("g2", GameEngine(ruleSet = DefaultRules), PlayerInfo(PlayerId("p1"), "P1"), PlayerInfo(PlayerId("p2"), "P2"))
+    val entry = GameEntry(
+      "g2",
+      GameEngine(ruleSet = DefaultRules),
+      PlayerInfo(PlayerId("p1"), "P1"),
+      PlayerInfo(PlayerId("p2"), "P2"),
+    )
     registry.store(entry)
     val retrieved = registry.get("g2")
     assertTrue(retrieved.isDefined)
@@ -42,7 +52,12 @@ class GameRegistryImplTest:
   @Test
   @DisplayName("update modifies existing entry")
   def testUpdate(): Unit =
-    val entry = GameEntry("g3", GameEngine(ruleSet = DefaultRules), PlayerInfo(PlayerId("p1"), "P1"), PlayerInfo(PlayerId("p2"), "P2"))
+    val entry = GameEntry(
+      "g3",
+      GameEngine(ruleSet = DefaultRules),
+      PlayerInfo(PlayerId("p1"), "P1"),
+      PlayerInfo(PlayerId("p2"), "P2"),
+    )
     registry.store(entry)
     val updated = entry.copy(resigned = true)
     registry.update(updated)