diff --git a/.scalafmt.conf b/.scalafmt.conf
index 9c7929b..be3b2cb 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -1,5 +1,5 @@
 // See: https://github.com/scalameta/scalafmt/tags for the latest tags.
-version = 3.8.1
+version = 3.9.9
 runner.dialect = scala3
 maxColumn = 80
 
diff --git a/modules/reporting/src/main/scala/gs/test/v0/reporting/PlainResultFormatter.scala b/modules/reporting/src/main/scala/gs/test/v0/reporting/PlainResultFormatter.scala
index eef803f..ccf0be7 100644
--- a/modules/reporting/src/main/scala/gs/test/v0/reporting/PlainResultFormatter.scala
+++ b/modules/reporting/src/main/scala/gs/test/v0/reporting/PlainResultFormatter.scala
@@ -54,7 +54,7 @@ final class PlainResultFormatter extends ResultFormatter:
   private def makeFailure(result: Either[TestFailure, Any]): String =
     result match
       case Right(_) => ""
-      case Left(f) =>
+      case Left(f)  =>
         s"""\n------
         ${f.message}
         """.stripMargin
diff --git a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/TestEngine.scala b/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/TestEngine.scala
index b12546c..7b65e2a 100644
--- a/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/TestEngine.scala
+++ b/modules/runtime/src/main/scala/gs/test/v0/runtime/engine/TestEngine.scala
@@ -246,13 +246,13 @@ final class TestEngine[F[_]: Async](
   private def parseTraceId(candidate: Option[String]): String =
     candidate match
       case Some(traceId) => traceId
-      case None =>
+      case None          =>
         throw new IllegalArgumentException("Created a span without a Trace ID!")
 
   private def parseSpanId(candidate: Option[String]): String =
     candidate match
       case Some(spanId) => spanId
-      case None =>
+      case None         =>
         throw new IllegalArgumentException("Created a span without a Span ID!")
 
   private def makeSuiteExecution(