diff --git a/build.sbt b/build.sbt
index 2b3e7916..c89a7c3b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -29,14 +29,14 @@ val scalacOpts = List(
 
 val dotcOpts = List("-Xdiags:verbose")
 
-ThisBuild / Compile / scalacOptions := {
+Compile / scalacOptions := {
   if (isDotty.value) dotcOpts else scalacOpts
 }
-ThisBuild / Test / scalacOptions := {
+Test / scalacOptions := {
   if (isDotty.value) dotcOpts else scalacOpts
 }
 
-scalacOptions in (Compile, console) --= Seq(
+Compile / console / scalacOptions --= Seq(
   "-Ywarn-unused:imports",
   "-Xfatal-warnings"
 )
@@ -110,6 +110,7 @@ lazy val sconfig = crossProject(JVMPlatform, NativePlatform, JSPlatform)
       .withDottyCompat(scalaVersion.value)
   )
   .jvmSettings(
+    crossScalaVersions := versionsJVM,
     sharedJvmNativeSource,
     libraryDependencies ++= Seq(
       "io.crashbox"  %% "spray-json"     % "1.3.5-7" % Test,
@@ -123,28 +124,9 @@ lazy val sconfig = crossProject(JVMPlatform, NativePlatform, JSPlatform)
       "-g",
       "-Xlint:unchecked"
     ),
-    // Dotty is missing serializable support
-    // Can Filter based on Test name but not method name with "erializ"
-    // so exclude the Tests with the 19 that cannot pass
-    // 530 - 19 = 511 Only 346 get run this way so we lose coverage
-    Test / testOptions := {
-      if (isDotty.value)
-        Seq(
-          Tests.Exclude(
-            Seq(
-              "org.ekrich.config.impl.ValidationTest",
-              "org.ekrich.config.impl.PublicApiTest",
-              "org.ekrich.config.impl.ConfigValueTest",
-              "org.ekrich.config.impl.ConfigTest"
-            )
-          )
-        )
-      else Seq(Tests.Exclude(Seq()))
-    },
     // because we test some global state such as singleton caches,
     // we have to run tests in serial.
     Test / parallelExecution := false,
-    test / fork := true,
     Test / fork := true,
     run / fork := true,
     Test / run / fork := true,
diff --git a/project/build.properties b/project/build.properties
index 6db98425..0837f7a1 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.4.0
+sbt.version=1.3.13
diff --git a/sconfig/jvm/src/test/scala/org/ekrich/config/impl/TestUtils.scala b/sconfig/jvm/src/test/scala/org/ekrich/config/impl/TestUtils.scala
index 9e55b8d1..df8fe653 100644
--- a/sconfig/jvm/src/test/scala/org/ekrich/config/impl/TestUtils.scala
+++ b/sconfig/jvm/src/test/scala/org/ekrich/config/impl/TestUtils.scala
@@ -998,8 +998,10 @@ abstract trait TestUtils {
         .sortBy(_.path)
         .sortBy(_.origin.lineNumber)
 
-    //for (problem <- problems)
-    //    System.err.println(problem.origin.description() + ": " + problem.path() + ": " + problem.problem())
+    // for (problem <- problems)
+    //   System.err.println(
+    //     problem.origin.description + ": " + problem.path + ": " + problem.problem
+    //   )
 
     for ((problem, expected) <- problems zip expecteds) {
       expected.check(problem)
diff --git a/sconfig/jvm/src/test/scala/org/ekrich/config/impl/ValidationTest.scala b/sconfig/jvm/src/test/scala/org/ekrich/config/impl/ValidationTest.scala
index f78687ce..8b451405 100644
--- a/sconfig/jvm/src/test/scala/org/ekrich/config/impl/ValidationTest.scala
+++ b/sconfig/jvm/src/test/scala/org/ekrich/config/impl/ValidationTest.scala
@@ -113,7 +113,7 @@ class ValidationTest extends TestUtils {
     checkValidationException(e, expecteds)
   }
 
-  @Test
+  @Test @Ignore("https://github.com/lampepfl/dotty/issues/9881")
   def validationFailedSerializable(): Unit = {
     // Reusing a previous test case to generate an error
     val reference = parseConfig("""{ a : [{},{},{}] }""")
@@ -121,7 +121,6 @@ class ValidationTest extends TestUtils {
     val e = intercept[ConfigException.ValidationFailed] {
       conf.checkValid(reference)
     }
-
     val expecteds = Seq(WrongType("a", 1, "list", "number"))
 
     val actual = checkSerializableNoMeaningfulEquals(e)
diff --git a/sconfig/shared/src/main/scala/org/ekrich/config/ConfigException.scala b/sconfig/shared/src/main/scala/org/ekrich/config/ConfigException.scala
index 64802298..12108077 100644
--- a/sconfig/shared/src/main/scala/org/ekrich/config/ConfigException.scala
+++ b/sconfig/shared/src/main/scala/org/ekrich/config/ConfigException.scala
@@ -63,18 +63,21 @@ object ConfigException {
       origin: ConfigOrigin
   ): Unit = {
     // circumvent "final"
-    var f: Field = null
-    try {
-      f = clazz.getDeclaredField("origin");
-    } catch {
-      case e: NoSuchFieldException =>
-        throw new IOException(clazz.getSimpleName + " has no origin field?", e)
-      case e: SecurityException =>
-        throw new IOException(
-          "unable to fill out origin field in " + clazz.getSimpleName,
-          e
-        )
-    }
+    val f: Field =
+      try {
+        clazz.getDeclaredField("origin");
+      } catch {
+        case e: NoSuchFieldException =>
+          throw new IOException(
+            clazz.getSimpleName + " has no origin field?",
+            e
+          )
+        case e: SecurityException =>
+          throw new IOException(
+            "unable to fill out origin field in " + clazz.getSimpleName,
+            e
+          )
+      }
 
     f.setAccessible(true)
     try {