diff --git a/build.sbt b/build.sbt
index 53f9529..6fe8c84 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,18 +1,28 @@
 // gallia-avro
 
+// ===========================================================================
+ThisBuild / organizationName     := "Gallia Project"
+ThisBuild / organization         := "io.github.galliaproject" // *must* match groupId for sonatype
+ThisBuild / organizationHomepage := Some(url("https://github.com/galliaproject"))
+ThisBuild / startYear            := Some(2021)
+ThisBuild / version              := "0.6.0-SNAPSHOT"
+ThisBuild / description          := "A Scala library for data manipulation"
+ThisBuild / homepage             := Some(url("https://github.com/galliaproject/gallia-avro"))
+ThisBuild / licenses             := Seq("Apache 2" -> url("https://github.com/galliaproject/gallia-avro/blob/master/LICENSE"))
+ThisBuild / developers           := List(Developer(
+  id    = "anthony-cros",
+  name  = "Anthony Cros",
+  email = "contact.galliaproject@gmail.com",
+  url   = url("https://github.com/anthony-cros")))
+ThisBuild / scmInfo              := Some(ScmInfo(
+  browseUrl  = url("https://github.com/galliaproject/gallia-core"),
+  connection =     "scm:git@github.com:galliaproject/gallia-core.git"))
+
 // ===========================================================================
 lazy val root = (project in file("."))
   .settings(
-    organizationName     := "Gallia Project",
-    organization         := "io.github.galliaproject", // *must* match groupId for sonatype
-    name                 := "gallia-avro",
-    version              := GalliaCommonSettings.CurrentGalliaVersion,
-    homepage             := Some(url("https://github.com/galliaproject/gallia-avro")),
-    scmInfo              := Some(ScmInfo(
-        browseUrl  = url("https://github.com/galliaproject/gallia-avro"),
-        connection =     "scm:git@github.com:galliaproject/gallia-avro.git")),
-    licenses             := Seq("Apache 2" -> url("https://github.com/galliaproject/gallia-avro/blob/master/LICENSE")),
-    description          := "A Scala library for data manipulation" )
+    name   := "gallia-avro",
+    target := baseDirectory.value / "bin" / "avro")
   .settings(GalliaCommonSettings.mainSettings:_*)
 
 // ===========================================================================
@@ -21,7 +31,7 @@ lazy val slf4jVersion = "1.7.36"
 
 // ---------------------------------------------------------------------------
 libraryDependencies ++= Seq(
-  "io.github.galliaproject" %% "gallia-core"   % GalliaCommonSettings.CurrentGalliaVersion,
+  "io.github.galliaproject" %% "gallia-core"   % version.value,
   "org.slf4j"               %  "slf4j-nop"     % slf4jVersion,
   "org.apache.avro"         %  "avro"          % avroVersion,
   "org.apache.avro"         %  "avro-compiler" % avroVersion /* just to deserialize IDL (as opposed to JSON)... */) // any way to serialize IDL (t220224102703)?
diff --git a/project/GalliaCommonSettings.scala b/project/GalliaCommonSettings.scala
index 4fc93af..a39e427 100644
--- a/project/GalliaCommonSettings.scala
+++ b/project/GalliaCommonSettings.scala
@@ -3,35 +3,19 @@ import sbt.Keys._
 
 // ===========================================================================
 object GalliaCommonSettings {
-  val CurrentGalliaVersion = "0.5.0"
-
+  val scala3   = "3.3.1"
+  val scala213 = "2.13.12"
+  val scala212 = "2.12.18"
+  
   // ---------------------------------------------------------------------------
   val mainSettings = Seq(
-    organizationHomepage := Some(url("https://github.com/galliaproject")),
-    startYear            := Some(2021),
-    developers           :=
-      List(Developer(
-        id    = "anthony-cros",
-        name  = "Anthony Cros",
-        email = "contact.galliaproject@gmail.com",
-        url   = url("https://github.com/anthony-cros") )),
-
+         scalaVersion  :=      scala3,
+    crossScalaVersions := List(scala3, scala213, scala212),
     // ---------------------------------------------------------------------------
-         scalaVersion  := GalliaScalaVersions.supported.head,
-    crossScalaVersions := GalliaScalaVersions.supported)
-
-  // ===========================================================================
-  // TODO: t210121165741: -Xdisable-assertions (also turns off require?)  
-  scalacOptions ++= Seq(
-        "-encoding", "UTF-8",  
-      //"-Yimports:java.lang,scala,scala.Predef,scala.util.chaining,aptus.Anything_" -- not possible for 2.12 it seems (TODO: t210308154253 confirm)
-        "-Ywarn-value-discard") ++ 
-      // ---------------------------------------------------------------------------
-      (scalaBinaryVersion.value match {
-        case "2.13" => Seq("-Ywarn-unused:imports")
-        case _      => Seq("-Ywarn-unused-import" ) })
-
-}
+    scalacOptions ++= (scalaBinaryVersion.value match {
+      case "3"    => GalliaScalacOptions.scala3Options
+      case "2.13" => GalliaScalacOptions.scala213Options
+      case "2.12" => GalliaScalacOptions.scala212Options })) }
 
 // ===========================================================================
 
diff --git a/project/GalliaScalaVersions.scala b/project/GalliaScalaVersions.scala
deleted file mode 100644
index 39c81a9..0000000
--- a/project/GalliaScalaVersions.scala
+++ /dev/null
@@ -1,15 +0,0 @@
-import sbt._
-
-// ===========================================================================
-object GalliaScalaVersions {
-  val scala213 = "2.13.12"
-  val scala212 = "2.12.18"
-  
-  // ---------------------------------------------------------------------------
-  val supported = List(
-    scala213,
-    scala212)
-}
-
-// ===========================================================================
-
diff --git a/project/GalliaScalacOptions.scala b/project/GalliaScalacOptions.scala
new file mode 100644
index 0000000..e19c0df
--- /dev/null
+++ b/project/GalliaScalacOptions.scala
@@ -0,0 +1,27 @@
+// ===========================================================================
+object GalliaScalacOptions {
+
+  val commonOptions = Seq(
+      "-encoding", "UTF-8",
+      "-feature",
+      "-unchecked",
+      "-deprecation",
+
+      "-language:implicitConversions")
+
+  // ===========================================================================
+  val commonOptionsExcept212 = Seq(      
+      "-Wunused:implicits",
+      "-Wunused:explicits",
+      "-Wunused:imports",
+      "-Wunused:locals",
+      "-Wunused:params",
+      "-Wunused:privates")
+
+  // ===========================================================================
+  val scala3Options   = commonOptions ++ commonOptionsExcept212 ++ Seq("-no-indent",       "-Wvalue-discard")
+  val scala213Options = commonOptions ++ commonOptionsExcept212 ++ Seq("-Wdead-code", "-Ywarn-value-discard")
+  val scala212Options = commonOptions ++                           Seq(               "-Ywarn-value-discard", "-Ywarn-unused-import" ) }
+
+// ===========================================================================
+
diff --git a/project/build.properties b/project/build.properties
index 19479ba..40b3b8e 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.2
+sbt.version=1.9.0