diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 67395f2..7e1d68e 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -23,5 +23,7 @@ jobs:
       - uses: coursier/setup-action@v1
         with:
           jvm: adopt:1.8
-      - name: Build, test, and package project
-        run: bin/sbt clean compile test package makePom
+      - name: Build, test, and package project on Spark 3.5
+        run: bin/sbt clean compile test package makePom -DsparkVersion=3.5.1
+      - name: Build and package project on "legacy" Spark
+        run: bin/sbt clean compile package makePom
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index baa6c8f..4c6c21c 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -25,3 +25,5 @@ jobs:
       # uses sbt-github-packages, see build.sbt
       - name: Publish with SBT
         run: bin/sbt publish
+      - name: Publish with SBT
+        run: bin/sbt publish -DsparkVersion=3.5.1
diff --git a/README.md b/README.md
index c4bbe6d..c7aee7f 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,9 @@ Usage: data-validator [options]
   --help                   Show this help message and exit.
 ```
 
+If you want to build with Java 11 or newer, set the "MODERN_JAVA" environment variable.
+This may become the default in the future.
+
 ## Example Run
 
 With the JAR directly:
diff --git a/bin/sbt b/bin/sbt
index 19d8917..8ecfd33 100755
--- a/bin/sbt
+++ b/bin/sbt
@@ -34,11 +34,11 @@
 
 set -o pipefail
 
-declare -r sbt_release_version="1.6.2"
-declare -r sbt_unreleased_version="1.7.0-M2"
+declare -r sbt_release_version="1.9.9"
+declare -r sbt_unreleased_version="1.9.9"
 
-declare -r latest_213="2.13.8"
-declare -r latest_212="2.12.15"
+declare -r latest_213="2.13.13"
+declare -r latest_212="2.12.19"
 declare -r latest_211="2.11.12"
 declare -r latest_210="2.10.7"
 declare -r latest_29="2.9.3"
diff --git a/build.sbt b/build.sbt
index 61e2c89..c0034ad 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,11 +1,42 @@
 name := "data-validator"
 organization := "com.target"
 
-scalaVersion := "2.11.12"
+val sparkVersion = settingKey[String]("Spark version")
 
-val sparkVersion = "2.3.4"
+sparkVersion := System.getProperty("sparkVersion", "2.3.4")
 
-val circeVersion = "0.11.2"
+scalaVersion := {
+  if (sparkVersion.value > "3.0") {
+    "2.12.19"
+  } else {
+    "2.11.12"
+  }
+}
+
+val sparkValidationVersion = settingKey[String]("Version of package")
+
+sparkValidationVersion := "0.15.0"
+
+version := sparkVersion.value + "_" + sparkValidationVersion.value
+
+val circeVersion = settingKey[String]("Circe version")
+val circeYamlVersion = settingKey[String]("Circe YAML version")
+
+circeVersion := {
+  if (sparkVersion.value > "3.0") {
+    "0.14.6"
+  } else {
+    "0.11.2"
+  }
+}
+
+circeYamlVersion := {
+  if (sparkVersion.value > "3.0") {
+    "0.15.1"
+  } else {
+    "0.10.1"
+  }
+}
 
 //addDependencyTreePlugin
 enablePlugins(GitVersioning)
@@ -35,18 +66,28 @@ libraryDependencies ++= Seq(
   "com.github.scopt" %% "scopt" % "4.1.0",
   "com.sun.mail" % "javax.mail" % "1.6.2",
   "com.lihaoyi" %% "scalatags" % "0.12.0",
-  "io.circe" %% "circe-yaml" % "0.10.1",
-  "io.circe" %% "circe-core" % circeVersion,
-  "io.circe" %% "circe-generic" % circeVersion,
-  "io.circe" %% "circe-parser" % circeVersion,
-  "org.apache.spark" %% "spark-sql" % sparkVersion % Provided,
+  "io.circe" %% "circe-yaml" % circeYamlVersion.value,
+  "io.circe" %% "circe-core" % circeVersion.value,
+  "io.circe" %% "circe-generic" % circeVersion.value,
+  "io.circe" %% "circe-parser" % circeVersion.value,
+  "org.apache.spark" %% "spark-sql" % sparkVersion.value % Provided,
   "junit" % "junit" % "4.13.2" % Test,
-  "org.scalatest" %% "scalatest" % "3.2.17" % Test,
+  "org.scalatest" %% "scalatest" % "3.2.18" % Test,
   "com.github.sbt" % "junit-interface" % "0.13.3" % Test exclude ("junit", "junit-dep")
 )
 
 Test / fork := true
-javaOptions ++= Seq("-Xms512M", "-Xmx2048M", "-XX:+CMSClassUnloadingEnabled")
+javaOptions ++= (if (sparkVersion.value > "3.0" && System.getenv("MODERN_JAVA") == "TRUE") {
+  // For modern Java we need to open up a lot of config options.
+  Seq("-Xms4048M", "-Xmx4048M",
+    // these were added in JDK 11 and newer, apparently.
+    "-Dio.netty.tryReflectionSetAccessible=true",
+    "--add-opens=java.base/java.lang=ALL-UNNAMED",
+    "--add-opens=java.base/java.io=ALL-UNNAMED",
+    "--add-opens=java.base/sun.nio.ch=ALL-UNNAMED")
+} else {
+    Seq("-Xms4048M", "-Xmx4048M")
+})
 Test / parallelExecution := false
 // required for unit tests, but not set in some environments
 Test / envVars ++= Map(
@@ -57,6 +98,11 @@ Test / envVars ++= Map(
 
 assembly / mainClass := Some("com.target.data_validator.Main")
 
+assembly / assemblyShadeRules := Seq(
+        ShadeRule.rename("shapeless.**" -> "new_shapeless.@1").inAll,
+        ShadeRule.rename("cats.kernel.**" -> s"new_cats.kernel.@1").inAll
+      )
+
 // Enforces scalastyle checks
 val compileScalastyle = TaskKey[Unit]("compileScalastyle")
 scalastyleFailOnWarning := true
@@ -75,6 +121,6 @@ compileScalastyle := (Compile / scalastyle).toTask("").value
 
 (Compile / runMain) := Defaults.runMainTask(Compile / fullClasspath, Compile / run / runner).evaluated
 TaskKey[Unit]("generateTestData") := {
-  libraryDependencies += "org.apache.spark" %% "spark-sql" % sparkVersion
+  libraryDependencies += "org.apache.spark" %% "spark-sql" % sparkVersion.value
   (Compile / runMain).toTask(" com.target.data_validator.GenTestData").value
 }
diff --git a/project/assembly.sbt b/project/assembly.sbt
index d83c883..e5ab6cc 100644
--- a/project/assembly.sbt
+++ b/project/assembly.sbt
@@ -1 +1 @@
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.1.5")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.2.0")
diff --git a/project/build.properties b/project/build.properties
index 0aa5c39..49214c4 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version = 1.9.8
+sbt.version = 1.9.9
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 742243d..a56f0eb 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -2,4 +2,5 @@ addSbtPlugin("org.scalastyle" %% "scalastyle-sbt-plugin" % "1.0.0")
 addSbtPlugin("com.github.sbt" % "sbt-git" % "2.0.1")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.12.0")
 addSbtPlugin("com.codecommit" % "sbt-github-packages" % "0.5.3")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.10.4")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")
diff --git a/src/main/scala/com/target/data_validator/validator/ColumnBased.scala b/src/main/scala/com/target/data_validator/validator/ColumnBased.scala
index a283ab2..21c43c7 100644
--- a/src/main/scala/com/target/data_validator/validator/ColumnBased.scala
+++ b/src/main/scala/com/target/data_validator/validator/ColumnBased.scala
@@ -86,7 +86,7 @@ case class MinNumRows(minNumRows: Json) extends ColumnBased("", ValidatorBase.L0
 }
 
 case class ColumnMaxCheck(column: String, value: Json)
-    extends ColumnBased(column, Max(UnresolvedAttribute(column)).toAggregateExpression()) {
+    extends ColumnBased(column, Max(UnresolvedAttribute.quoted(column)).toAggregateExpression()) {
 
   override def substituteVariables(dict: VarSubstitution): ValidatorBase = {
     val ret = copy(column = getVarSub(column, "column", dict), value = getVarSubJson(value, "value", dict))
diff --git a/src/main/scala/com/target/data_validator/validator/ColumnSumCheck.scala b/src/main/scala/com/target/data_validator/validator/ColumnSumCheck.scala
index 6a01263..d5196f9 100644
--- a/src/main/scala/com/target/data_validator/validator/ColumnSumCheck.scala
+++ b/src/main/scala/com/target/data_validator/validator/ColumnSumCheck.scala
@@ -16,7 +16,7 @@ case class ColumnSumCheck(
     minValue: Option[Json] = None,
     maxValue: Option[Json] = None,
     inclusive: Option[Json] = None
-) extends ColumnBased(column, Sum(UnresolvedAttribute(column)).toAggregateExpression()) {
+) extends ColumnBased(column, Sum(UnresolvedAttribute.quoted(column)).toAggregateExpression()) {
 
   private val minOrMax: Either[String, Unit] = if (minValue.isEmpty && maxValue.isEmpty) {
     Left("'minValue' or 'maxValue' or both must be defined")
@@ -78,13 +78,14 @@ case class ColumnSumCheck(
     }
 
     def getData(pctError: String): ListMap[String, String] = {
-      ((minValue, maxValue) match {
+      val initial: ListMap[String, String] = ((minValue, maxValue) match {
         case (Some(x), Some(y)) =>
           ListMap("lower_bound" -> x.asNumber.get.toString, "upper_bound" -> y.asNumber.get.toString)
         case (None, Some(y)) => ListMap("upper_bound" -> y.asNumber.get.toString)
         case (Some(x), None) => ListMap("lower_bound" -> x.asNumber.get.toString)
         case (None, None) => throw new RuntimeException("Must define at least one of minValue or maxValue.")
-      }) + ("inclusive" -> isInclusive.toString, "actual" -> r(idx).toString, "relative_error" -> pctError)
+      })
+      initial ++ List("inclusive" -> isInclusive.toString, "actual" -> r(idx).toString, "relative_error" -> pctError)
     }
 
     val actualSum: Double = dataType match {
diff --git a/src/main/scala/com/target/data_validator/validator/ValidatorBase.scala b/src/main/scala/com/target/data_validator/validator/ValidatorBase.scala
index 0134a3a..17d46af 100644
--- a/src/main/scala/com/target/data_validator/validator/ValidatorBase.scala
+++ b/src/main/scala/com/target/data_validator/validator/ValidatorBase.scala
@@ -141,8 +141,8 @@ object ValidatorBase extends LazyLogging {
   private val backtick = "`"
   val I0: Literal = Literal.create(0, IntegerType)
   val D0: Literal = Literal.create(0.0, DoubleType)
-  val L0: Literal = Literal.create(0, LongType)
-  val L1: Literal = Literal.create(1, LongType)
+  val L0: Literal = Literal.create(0L, LongType)
+  val L1: Literal = Literal.create(1L, LongType)
 
   def isValueColumn(v: String): Boolean = v.startsWith(backtick)
 
diff --git a/src/test/scala/com/target/data_validator/validator/RangeCheckSpec.scala b/src/test/scala/com/target/data_validator/validator/RangeCheckSpec.scala
index 9a77175..37e2198 100644
--- a/src/test/scala/com/target/data_validator/validator/RangeCheckSpec.scala
+++ b/src/test/scala/com/target/data_validator/validator/RangeCheckSpec.scala
@@ -305,7 +305,7 @@ class RangeCheckSpec extends AnyFunSpec with Matchers with TestingSparkSession {
             ValidatorQuickCheckError(
               ("item", "Eggs") :: Nil,
               5.99,
-              "RangeCheck failed! max = 5.99 and (('max <= 6.0) || ('max >= 10.0))"
+              "RangeCheck failed! max = 5.99 and (('max <= 6.0) OR ('max >= 10.0))"
             )
         )
       }
@@ -341,7 +341,7 @@ class RangeCheckSpec extends AnyFunSpec with Matchers with TestingSparkSession {
         val dict = new VarSubstitution
         val df = mkDataFrame(spark, defData)
         assert(!sut.configCheck(df))
-        assert(sut.colTest(df.schema, dict).sql == "((`avg` < `min`) OR (`avg` > `max`))")
+        assert(sut.colTest(df.schema, dict).sql == "((avg < min) OR (avg > max))")
       }
 
       it("bad minValue column") {
@@ -395,7 +395,7 @@ class RangeCheckSpec extends AnyFunSpec with Matchers with TestingSparkSession {
             ValidatorQuickCheckError(
               ("item", "Bread") :: Nil,
               0.99,
-              "RangeCheck failed! avg = 0.99 and (('avg <= 'min) || ('avg >= 'max))"
+              "RangeCheck failed! avg = 0.99 and (('avg <= 'min) OR ('avg >= 'max))"
             )
         )
       }
diff --git a/src/test/scala/com/target/data_validator/validator/StringLengthCheckSpec.scala b/src/test/scala/com/target/data_validator/validator/StringLengthCheckSpec.scala
index 3e0493f..0166030 100644
--- a/src/test/scala/com/target/data_validator/validator/StringLengthCheckSpec.scala
+++ b/src/test/scala/com/target/data_validator/validator/StringLengthCheckSpec.scala
@@ -327,13 +327,13 @@ class StringLengthCheckSpec extends AnyFunSpec with Matchers with TestingSparkSe
             ValidatorQuickCheckError(
               ("item", "I") :: Nil,
               "I",
-              "StringLengthCheck failed! item = I and ((length('item) < 5) || (length('item) > 6))"
+              "StringLengthCheck failed! item = I and ((length('item) < 5) OR (length('item) > 6))"
             )) ^
             (sut.getEvents contains
               ValidatorQuickCheckError(
                 ("item", "") :: Nil,
                 "",
-                "StringLengthCheck failed! item =  and ((length('item) < 5) || (length('item) > 6))"
+                "StringLengthCheck failed! item =  and ((length('item) < 5) OR (length('item) > 6))"
               ))
         )
       }
@@ -364,7 +364,7 @@ class StringLengthCheckSpec extends AnyFunSpec with Matchers with TestingSparkSe
             ValidatorQuickCheckError(
               ("item", "I") :: Nil,
               "I",
-              "StringLengthCheck failed! item = I and ((length('item) < 5) || (length('item) > 6))"
+              "StringLengthCheck failed! item = I and ((length('item) < 5) OR (length('item) > 6))"
             )
         )
 
@@ -373,7 +373,7 @@ class StringLengthCheckSpec extends AnyFunSpec with Matchers with TestingSparkSe
             ValidatorQuickCheckError(
               ("item", "") :: Nil,
               "",
-              "StringLengthCheck failed! item =  and ((length('item) < 5) || (length('item) > 6))"
+              "StringLengthCheck failed! item =  and ((length('item) < 5) OR (length('item) > 6))"
             )
         )
       }
@@ -404,7 +404,7 @@ class StringLengthCheckSpec extends AnyFunSpec with Matchers with TestingSparkSe
             ValidatorQuickCheckError(
               ("item", "I") :: Nil,
               "I",
-              "StringLengthCheck failed! item = I and ((length('item) < 5) || (length('item) > 5))"
+              "StringLengthCheck failed! item = I and ((length('item) < 5) OR (length('item) > 5))"
             )
         )
 
@@ -413,7 +413,7 @@ class StringLengthCheckSpec extends AnyFunSpec with Matchers with TestingSparkSe
             ValidatorQuickCheckError(
               ("item", "") :: Nil,
               "",
-              "StringLengthCheck failed! item =  and ((length('item) < 5) || (length('item) > 5))"
+              "StringLengthCheck failed! item =  and ((length('item) < 5) OR (length('item) > 5))"
             )
         )
 
@@ -422,7 +422,7 @@ class StringLengthCheckSpec extends AnyFunSpec with Matchers with TestingSparkSe
             ValidatorQuickCheckError(
               ("item", "Item23") :: Nil,
               "Item23",
-              "StringLengthCheck failed! item = Item23 and ((length('item) < 5) || (length('item) > 5))"
+              "StringLengthCheck failed! item = Item23 and ((length('item) < 5) OR (length('item) > 5))"
             )
         )
       }
diff --git a/src/test/scala/com/target/data_validator/validator/StringRegexCheckSpec.scala b/src/test/scala/com/target/data_validator/validator/StringRegexCheckSpec.scala
index 542049e..23b59c9 100644
--- a/src/test/scala/com/target/data_validator/validator/StringRegexCheckSpec.scala
+++ b/src/test/scala/com/target/data_validator/validator/StringRegexCheckSpec.scala
@@ -183,7 +183,7 @@ class StringRegexCheckSpec extends AnyFunSpec with Matchers with TestingSparkSes
             ValidatorQuickCheckError(
               ("item", "I") :: Nil,
               "I",
-              "StringRegexCheck failed! item = I and (NOT 'item RLIKE ^It && isnotnull('item))"
+              "StringRegexCheck failed! item = I and (NOT RLIKE('item, ^It) AND isnotnull('item))"
             )
         )
       }
@@ -214,7 +214,7 @@ class StringRegexCheckSpec extends AnyFunSpec with Matchers with TestingSparkSes
             ValidatorQuickCheckError(
               ("item", "I") :: Nil,
               "I",
-              "StringRegexCheck failed! item = I and (NOT 'item RLIKE ^Item2 && isnotnull('item))"
+              "StringRegexCheck failed! item = I and (NOT RLIKE('item, ^Item2) AND isnotnull('item))"
             )
         )
 
@@ -223,7 +223,7 @@ class StringRegexCheckSpec extends AnyFunSpec with Matchers with TestingSparkSes
             ValidatorQuickCheckError(
               ("item", "Item1") :: Nil,
               "Item1",
-              "StringRegexCheck failed! item = Item1 and (NOT 'item RLIKE ^Item2 && isnotnull('item))"
+              "StringRegexCheck failed! item = Item1 and (NOT RLIKE('item, ^Item2) AND isnotnull('item))"
             )
         )
       }
@@ -254,13 +254,13 @@ class StringRegexCheckSpec extends AnyFunSpec with Matchers with TestingSparkSes
             ValidatorQuickCheckError(
               ("item", "I") :: Nil,
               "I",
-              "StringRegexCheck failed! item = I and (NOT 'item RLIKE ^Item2 && isnotnull('item))"
+              "StringRegexCheck failed! item = I and (NOT RLIKE('item, ^Item2) AND isnotnull('item))"
             )) ^
             (sut.getEvents contains
               ValidatorQuickCheckError(
                 ("item", "Item1") :: Nil,
                 "Item1",
-                "StringRegexCheck failed! item = Item1 and (NOT 'item RLIKE ^Item2 && isnotnull('item))"
+                "StringRegexCheck failed! item = Item1 and (NOT RLIKE('item, ^Item2) AND isnotnull('item))"
               ))
         )
       }