diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9049dd13c..ad88219d2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,6 +51,7 @@ jobs:
       JVM_OPTS: -Xms800M -Xmx2G -Xss6M -XX:ReservedCodeCacheSize=128M -server -Dsbt.io.virtual=false -Dfile.encoding=UTF-8
       SCALA_212: 2.12.15
       SCALA_213: 2.13.6
+      SCALA_3: 3.1.0
       UTIL_TESTS: "utilCache/test utilControl/test utilInterface/test utilLogging/test utilPosition/test utilRelation/test utilScripted/test utilTracking/test"
       SBT_LOCAL: false
       TEST_SBT_VER: 1.5.0
@@ -134,7 +135,7 @@ jobs:
       if: ${{ matrix.jobtype == 5 }}
       shell: bash
       run: |
-        ./sbt -v "++$SCALA_213!; test;"
+        ./sbt -v "++$SCALA_213!; test; ++$SCALA_3!; all utilControl/test utilRelation/test utilPosition/test"
     - name: Build and test (6)
       if: ${{ matrix.jobtype == 6 }}
       shell: bash
diff --git a/.scalafmt.conf b/.scalafmt.conf
index 213dea496..06a114f59 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -21,3 +21,8 @@ align.openParenDefnSite = false
 danglingParentheses = true
 
 trailingCommas = preserve
+
+# TODO update scalafmt and enable Scala 3
+project.excludeFilters = [
+  "internal/util-position/src/main/scala-3/sbt/internal/util/SourcePositionMacro.scala"
+]
diff --git a/internal/util-position/src/main/scala-2/sbt/internal/util/SourcePositionMacro.scala b/internal/util-position/src/main/scala-2/sbt/internal/util/SourcePositionMacro.scala
new file mode 100644
index 000000000..a4a38e744
--- /dev/null
+++ b/internal/util-position/src/main/scala-2/sbt/internal/util/SourcePositionMacro.scala
@@ -0,0 +1,53 @@
+/*
+ * sbt
+ * Copyright 2011 - 2018, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ * Licensed under Apache License 2.0 (see LICENSE)
+ */
+
+package sbt.internal.util
+
+import scala.language.experimental.macros
+import scala.annotation.tailrec
+import scala.reflect.macros.blackbox
+import scala.reflect.internal.util.UndefinedPosition
+
+abstract class SourcePositionImpl {
+
+  /** Creates a SourcePosition by using the enclosing position of the invocation of this method.
+   * @return SourcePosition
+   */
+  def fromEnclosing(): SourcePosition = macro SourcePositionMacro.fromEnclosingImpl
+}
+
+final class SourcePositionMacro(val c: blackbox.Context) {
+  import c.universe.{ NoPosition => _, _ }
+
+  def fromEnclosingImpl(): Expr[SourcePosition] = {
+    val pos = c.enclosingPosition
+    if (!pos.isInstanceOf[UndefinedPosition] && pos.line >= 0 && pos.source != null) {
+      val f = pos.source.file
+      val name = constant[String](ownerSource(f.path, f.name))
+      val line = constant[Int](pos.line)
+      reify { LinePosition(name.splice, line.splice) }
+    } else
+      reify { NoPosition }
+  }
+
+  private[this] def ownerSource(path: String, name: String): String = {
+    @tailrec def inEmptyPackage(s: Symbol): Boolean =
+      s != NoSymbol && (
+        s.owner == c.mirror.EmptyPackage
+          || s.owner == c.mirror.EmptyPackageClass
+          || inEmptyPackage(s.owner)
+      )
+
+    c.internal.enclosingOwner match {
+      case ec if !ec.isStatic       => name
+      case ec if inEmptyPackage(ec) => path
+      case ec                       => s"(${ec.fullName}) $name"
+    }
+  }
+
+  private[this] def constant[T: WeakTypeTag](t: T): Expr[T] = c.Expr[T](Literal(Constant(t)))
+}
diff --git a/internal/util-position/src/main/scala-3/sbt/internal/util/SourcePositionMacro.scala b/internal/util-position/src/main/scala-3/sbt/internal/util/SourcePositionMacro.scala
new file mode 100644
index 000000000..f6e45f37d
--- /dev/null
+++ b/internal/util-position/src/main/scala-3/sbt/internal/util/SourcePositionMacro.scala
@@ -0,0 +1,34 @@
+/*
+ * sbt
+ * Copyright 2011 - 2018, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ * Licensed under Apache License 2.0 (see LICENSE)
+ */
+
+package sbt.internal.util
+
+import scala.quoted.{ Expr, Quotes, quotes }
+
+abstract class SourcePositionImpl {
+
+  /** Creates a SourcePosition by using the enclosing position of the invocation of this method.
+   *
+   * @return SourcePosition
+   */
+  inline def fromEnclosing(): SourcePosition =
+    ${ SourcePositionImpl.fromEnclosingImpl }
+}
+
+object SourcePositionImpl {
+
+  def fromEnclosingImpl(using Quotes): Expr[SourcePosition] = {
+    val x = quotes.reflect.Position.ofMacroExpansion
+
+    '{
+      LinePosition(
+        path = ${Expr(x.sourceFile.name)},
+        startLine = ${Expr(x.startLine + 1)}
+      )
+    }
+  }
+}
diff --git a/internal/util-position/src/main/scala/sbt/internal/util/Positions.scala b/internal/util-position/src/main/scala/sbt/internal/util/Positions.scala
index c3895a4bd..78deb8e48 100644
--- a/internal/util-position/src/main/scala/sbt/internal/util/Positions.scala
+++ b/internal/util-position/src/main/scala/sbt/internal/util/Positions.scala
@@ -7,8 +7,6 @@
 
 package sbt.internal.util
 
-import scala.language.experimental.macros
-
 sealed trait SourcePosition
 
 sealed trait FilePosition extends SourcePosition {
@@ -28,47 +26,4 @@ final case class RangePosition(path: String, range: LineRange) extends FilePosit
   def startLine = range.start
 }
 
-object SourcePosition {
-
-  /** Creates a SourcePosition by using the enclosing position of the invocation of this method.
-   * @return SourcePosition
-   */
-  def fromEnclosing(): SourcePosition = macro SourcePositionMacro.fromEnclosingImpl
-
-}
-
-import scala.annotation.tailrec
-import scala.reflect.macros.blackbox
-import scala.reflect.internal.util.UndefinedPosition
-
-final class SourcePositionMacro(val c: blackbox.Context) {
-  import c.universe.{ NoPosition => _, _ }
-
-  def fromEnclosingImpl(): Expr[SourcePosition] = {
-    val pos = c.enclosingPosition
-    if (!pos.isInstanceOf[UndefinedPosition] && pos.line >= 0 && pos.source != null) {
-      val f = pos.source.file
-      val name = constant[String](ownerSource(f.path, f.name))
-      val line = constant[Int](pos.line)
-      reify { LinePosition(name.splice, line.splice) }
-    } else
-      reify { NoPosition }
-  }
-
-  private[this] def ownerSource(path: String, name: String): String = {
-    @tailrec def inEmptyPackage(s: Symbol): Boolean =
-      s != NoSymbol && (
-        s.owner == c.mirror.EmptyPackage
-          || s.owner == c.mirror.EmptyPackageClass
-          || inEmptyPackage(s.owner)
-      )
-
-    c.internal.enclosingOwner match {
-      case ec if !ec.isStatic       => name
-      case ec if inEmptyPackage(ec) => path
-      case ec                       => s"(${ec.fullName}) $name"
-    }
-  }
-
-  private[this] def constant[T: WeakTypeTag](t: T): Expr[T] = c.Expr[T](Literal(Constant(t)))
-}
+object SourcePosition extends SourcePositionImpl