diff --git a/.github/workflows/scala-ci.yml b/.github/workflows/scala-ci.yml
index 032b46592..bee91ff43 100644
--- a/.github/workflows/scala-ci.yml
+++ b/.github/workflows/scala-ci.yml
@@ -9,7 +9,7 @@ jobs:
           - spark-version: 3.5.4
             scala-version: 2.13.8
           - spark-version: 3.5.4
-            scala-version: 2.12.12
+            scala-version: 2.12.18
     runs-on: ubuntu-22.04
     env:
       # fixing this error after tests success: sbt.ForkMain failed with exit code 134
diff --git a/.gitignore b/.gitignore
index 3f992a889..a07973c1e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@ lib_managed/
 src_managed/
 project/boot/
 project/plugins/project/
+.bsp
 
 # intellij
 .idea/
diff --git a/build.sbt b/build.sbt
index d49da406e..061901717 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,92 +1,93 @@
-// Your sbt build file. Guides on how to write one can be found at
-// http://www.scala-sbt.org/0.13/docs/index.html
-
 import ReleaseTransformations._
 
-val sparkVer = sys.props.getOrElse("spark.version", "3.5.3")
-val sparkBranch = sparkVer.substring(0, 3)
-val defaultScalaVer = sparkBranch match {
+lazy val sparkVer = sys.props.getOrElse("spark.version", "3.5.4")
+lazy val sparkBranch = sparkVer.substring(0, 3)
+lazy val defaultScalaVer = sparkBranch match {
   case "3.5" => "2.12.18"
   case _ => throw new IllegalArgumentException(s"Unsupported Spark version: $sparkVer.")
 }
-val scalaVer = sys.props.getOrElse("scala.version", defaultScalaVer)
-val defaultScalaTestVer = scalaVer match {
+lazy val scalaVer = sys.props.getOrElse("scala.version", defaultScalaVer)
+lazy val defaultScalaTestVer = scalaVer match {
   case s if s.startsWith("2.12") || s.startsWith("2.13") => "3.0.8"
 }
 
-sparkVersion := sparkVer
-
-scalaVersion := scalaVer
-
-name := "graphframes"
-
-spName := "graphframes/graphframes"
-
-organization := "org.graphframes"
-
-version := (version in ThisBuild).value + s"-spark$sparkBranch"
-
-isSnapshot := version.value.contains("SNAPSHOT")
-
-// All Spark Packages need a license
-licenses := Seq("Apache-2.0" -> url("http://opensource.org/licenses/Apache-2.0"))
-
-spAppendScalaVersion := true
-
-// Add Spark components this package depends on, e.g, "mllib", ....
-sparkComponents ++= Seq("graphx", "sql", "mllib")
-
-// uncomment and change the value below to change the directory where your zip artifact will be created
-// spDistDirectory := target.value
-
-// add any Spark Package dependencies using spDependencies.
-// e.g. spDependencies += "databricks/spark-avro:0.1"
-
-libraryDependencies += "org.slf4j" % "slf4j-api" % "1.7.16"
-
-libraryDependencies += "org.scalatest" %% "scalatest" % defaultScalaTestVer % "test"
-
-libraryDependencies += "com.github.zafarkhaja" % "java-semver" % "0.9.0" % "test" // MIT license
-
-parallelExecution := false
-
-scalacOptions ++= Seq("-deprecation", "-feature")
-
-scalacOptions in (Compile, doc) ++= Seq(
-  "-groups",
-  "-implicits",
-  "-skip-packages", Seq("org.apache.spark").mkString(":"))
-
-scalacOptions in (Test, doc) ++= Seq("-groups", "-implicits")
-
-// This fixes a class loader problem with scala.Tuple2 class, scala-2.11, Spark 2.x
-fork in Test := true
-
-// This and the next line fix a problem with forked run: https://github.com/scalatest/scalatest/issues/770
-javaOptions in Test ++= Seq(
-  "-XX:+IgnoreUnrecognizedVMOptions",
-  "-Xmx2048m",
-  "-XX:ReservedCodeCacheSize=384m",
-  "-XX:MaxMetaspaceSize=384m",
-  "--add-opens=java.base/sun.nio.ch=ALL-UNNAMED",
-  "--add-opens=java.base/java.lang=ALL-UNNAMED"
-)
-
-concurrentRestrictions in Global := Seq(
-  Tags.limitAll(1))
-
-autoAPIMappings := true
-
-coverageHighlighting := false
-
-// We only use sbt-release to update version numbers.
-releaseProcess := Seq[ReleaseStep](
-  inquireVersions,
-  setReleaseVersion,
-  commitReleaseVersion,
-  tagRelease,
-  setNextVersion,
-  commitNextVersion
-)
+ThisBuild / version := {
+  val baseVersion = (ThisBuild / version).value
+  s"${baseVersion}-spark${sparkBranch}"
+}
 
-credentials += Credentials(Path.userHome / ".ivy2" / ".sbtcredentials")
+ThisBuild / scalaVersion := scalaVer
+ThisBuild / organization := "org.graphframes"
+ThisBuild / crossScalaVersions := Seq("2.12.18", "2.13.8")
+
+lazy val root = (project in file("."))
+  .settings(
+    name := "graphframes",
+
+    // Replace spark-packages plugin functionality with explicit dependencies
+    libraryDependencies ++= Seq(
+      "org.apache.spark" %% "spark-graphx" % sparkVer % "provided" cross CrossVersion.for3Use2_13,
+      "org.apache.spark" %% "spark-sql" % sparkVer % "provided" cross CrossVersion.for3Use2_13,
+      "org.apache.spark" %% "spark-mllib" % sparkVer % "provided" cross CrossVersion.for3Use2_13,
+      "org.slf4j" % "slf4j-api" % "1.7.16",
+      "org.scalatest" %% "scalatest" % defaultScalaTestVer % Test,
+      "com.github.zafarkhaja" % "java-semver" % "0.9.0" % Test
+    ),
+
+    licenses := Seq("Apache-2.0" -> url("http://opensource.org/licenses/Apache-2.0")),
+
+    // Modern way to set Scala options
+    Compile / scalacOptions ++= Seq("-deprecation", "-feature"),
+
+    Compile / doc / scalacOptions ++= Seq(
+      "-groups",
+      "-implicits",
+      "-skip-packages", Seq("org.apache.spark").mkString(":")
+    ),
+
+    Test / doc / scalacOptions ++= Seq("-groups", "-implicits"),
+
+    // Test settings
+    Test / fork := true,
+    Test / parallelExecution := false,
+
+    Test / javaOptions ++= Seq(
+      "-XX:+IgnoreUnrecognizedVMOptions",
+      "-Xmx2048m",
+      "-XX:ReservedCodeCacheSize=384m",
+      "-XX:MaxMetaspaceSize=384m",
+      "--add-opens=java.base/sun.nio.ch=ALL-UNNAMED",
+      "--add-opens=java.base/java.lang=ALL-UNNAMED"
+    ),
+
+    // Global settings
+    Global / concurrentRestrictions := Seq(
+      Tags.limitAll(1)
+    ),
+
+    autoAPIMappings := true,
+
+    coverageHighlighting := false,
+
+    // Release settings
+    releaseProcess := Seq[ReleaseStep](
+      inquireVersions,
+      setReleaseVersion,
+      commitReleaseVersion,
+      tagRelease,
+      setNextVersion,
+      commitNextVersion
+    ),
+
+    // Assembly settings
+    assembly / test := {}, // No tests in assembly
+    assembly / assemblyMergeStrategy := {
+      case PathList("META-INF", xs @ _*) => MergeStrategy.discard
+      case x if x.endsWith("module-info.class") => MergeStrategy.discard
+      case x =>
+        val oldStrategy = (assembly / assemblyMergeStrategy).value
+        oldStrategy(x)
+    },
+
+    credentials += Credentials(Path.userHome / ".ivy2" / ".sbtcredentials")
+  )
\ No newline at end of file
diff --git a/build/sbt-launch-lib.bash b/build/sbt-launch-lib.bash
index 6ab8d7313..01ba6b929 100755
--- a/build/sbt-launch-lib.bash
+++ b/build/sbt-launch-lib.bash
@@ -7,7 +7,7 @@
 # TODO - Should we merge the main SBT script with this library?
 
 if test -z "$HOME"; then
-  declare -r script_dir="$(dirname $script_path)"
+  declare -r script_dir="$(dirname "$script_path")"
 else
   declare -r script_dir="$HOME/.sbt"
 fi
@@ -17,6 +17,7 @@ declare -a java_args
 declare -a scalac_args
 declare -a sbt_commands
 declare -a maven_profiles
+declare sbt_default_mem=4096
 
 if test -x "$JAVA_HOME/bin/java"; then
     echo -e "Using $JAVA_HOME as default JAVA_HOME."
@@ -37,32 +38,36 @@ dlog () {
 }
 
 acquire_sbt_jar () {
-  SBT_VERSION=`awk -F "=" '/sbt\\.version/ {print $2}' ./project/build.properties`
-  URL1=https://repo.scala-sbt.org/scalasbt/ivy-releases/org.scala-sbt/sbt-launch/${SBT_VERSION}/sbt-launch.jar
+  SBT_VERSION=`awk -F "=" '/sbt\.version/ {print $2}' ./project/build.properties`
+  # DEFAULT_ARTIFACT_REPOSITORY env variable can be used to only fetch
+  # artifacts from internal repos only.
+  # Ex:
+  #   DEFAULT_ARTIFACT_REPOSITORY=https://artifacts.internal.com/libs-release/
+  URL1=${DEFAULT_ARTIFACT_REPOSITORY:-https://repo1.maven.org/maven2/}org/scala-sbt/sbt-launch/${SBT_VERSION}/sbt-launch-${SBT_VERSION}.jar
   JAR=build/sbt-launch-${SBT_VERSION}.jar
 
   sbt_jar=$JAR
 
   if [[ ! -f "$sbt_jar" ]]; then
     # Download sbt launch jar if it hasn't been downloaded yet
-    if [ ! -f ${JAR} ]; then
+    if [ ! -f "${JAR}" ]; then
     # Download
     printf "Attempting to fetch sbt\n"
-    JAR_DL=${JAR}.part
-    if hash curl 2>/dev/null; then
+    JAR_DL="${JAR}.part"
+    if [ $(command -v curl) ]; then
       curl --fail --location --silent ${URL1} > "${JAR_DL}" &&\
         mv "${JAR_DL}" "${JAR}"
-    elif hash wget 2>/dev/null; then
+    elif [ $(command -v wget) ]; then
       wget --quiet ${URL1} -O "${JAR_DL}" &&\
         mv "${JAR_DL}" "${JAR}"
     else
-      printf "You do not have curl or wget installed, please install sbt manually from http://www.scala-sbt.org/\n"
+      printf "You do not have curl or wget installed, please install sbt manually from https://www.scala-sbt.org/\n"
       exit -1
     fi
     fi
-    if [ ! -f ${JAR} ]; then
+    if [ ! -f "${JAR}" ]; then
     # We failed to download
-    printf "Our attempt to download sbt locally to ${JAR} failed. Please install sbt manually from http://www.scala-sbt.org/\n"
+    printf "Our attempt to download sbt locally to ${JAR} failed. Please install sbt manually from https://www.scala-sbt.org/\n"
     exit -1
     fi
     printf "Launching sbt from ${JAR}\n"
@@ -82,7 +87,7 @@ execRunner () {
     echo ""
   }
 
-  exec "$@"
+  "$@"
 }
 
 addJava () {
@@ -105,19 +110,18 @@ addResidual () {
   residual_args=( "${residual_args[@]}" "$1" )
 }
 addDebugger () {
-  addJava "-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=$1"
+  addJava "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=$1"
 }
 
 # a ham-fisted attempt to move some memory settings in concert
 # so they need not be dicked around with individually.
 get_mem_opts () {
-  local mem=${1:-2048}
-  local perm=$(( $mem / 4 ))
-  (( $perm > 256 )) || perm=256
-  (( $perm < 4096 )) || perm=4096
-  local codecache=$(( $perm / 2 ))
+  local mem=${1:-$sbt_default_mem}
+  local codecache=$(( $mem / 8 ))
+  (( $codecache > 128 )) || codecache=128
+  (( $codecache < 2048 )) || codecache=2048
 
-  echo "-Xms${mem}m -Xmx${mem}m -XX:MaxMetaspaceSize=${perm}m -XX:ReservedCodeCacheSize=${codecache}m"
+  echo "-Xms${mem}m -Xmx${mem}m -XX:ReservedCodeCacheSize=${codecache}m"
 }
 
 require_arg () {
@@ -125,7 +129,8 @@ require_arg () {
   local opt="$2"
   local arg="$3"
   if [[ -z "$arg" ]] || [[ "${arg:0:1}" == "-" ]]; then
-    die "$opt requires <$type> argument"
+    echo "$opt requires <$type> argument" 1>&2
+    exit 1
   fi
 }
 
@@ -178,18 +183,11 @@ run() {
 
   # run sbt
   execRunner "$java_cmd" \
-    ${SBT_OPTS:-$default_sbt_opts} \
     $(get_mem_opts $sbt_mem) \
+    ${SBT_OPTS:-$default_sbt_opts} \
     ${java_opts} \
     ${java_args[@]} \
     -jar "$sbt_jar" \
     "${sbt_commands[@]}" \
     "${residual_args[@]}"
 }
-
-runAlternateBoot() {
-  local bootpropsfile="$1"
-  shift
-  addJava "-Dsbt.boot.properties=$bootpropsfile"
-  run $@
-}
diff --git a/project/build.properties b/project/build.properties
index 5c4bcd91b..3c3220437 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1,2 +1,2 @@
 // This file should only contain the version of sbt to use.
-sbt.version=0.13.18
+sbt.version=1.9.3
diff --git a/project/plugins.sbt b/project/plugins.sbt
index a27f399b4..46028c336 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,10 +1,10 @@
-// You may use this file to add plugin dependencies for sbt.
-resolvers += "Spark Packages repo" at "https://repos.spark-packages.org/"
-
-addSbtPlugin("org.spark-packages" %% "sbt-spark-package" % "0.2.6")
-
-// scalacOptions in (Compile,doc) := Seq("-groups", "-implicits")
-
-addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.6.1")
-
-addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.13")
+// https://github.com/scala/bug/issues/12632
+// https://github.com/scoverage/sbt-scoverage/issues/475
+// Workaround:
+ThisBuild / libraryDependencySchemes ++= Seq(
+  "org.scala-lang.modules" %% "scala-xml" % VersionScheme.Always
+)
+
+addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.10")
+addSbtPlugin("com.github.sbt" % "sbt-release" % "1.4.0")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.1")
diff --git a/version.sbt b/version.sbt
index ca68fcbd5..f72bdcc0e 100644
--- a/version.sbt
+++ b/version.sbt
@@ -1 +1 @@
-version in ThisBuild := "0.8.4"
+ThisBuild / version := "0.8.4"