diff --git a/.github/workflows/check-build-test.yml b/.github/workflows/check-build-test.yml
index 4f3ee5f..8043e12 100644
--- a/.github/workflows/check-build-test.yml
+++ b/.github/workflows/check-build-test.yml
@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { sbtCrossVersion: "1.1.6", jvmName: "temurin:1.8.0"  }
+          - { sbtCrossVersion: "1.4.9", jvmName: "temurin:1.8.0"  }
           # { jvmName: "temurin:1.11.0" }
           # { jvmName: "temurin:1.17.0" }
     steps:
diff --git a/build.sbt b/build.sbt
index a2736c5..d783a7c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -9,7 +9,7 @@ organizationHomepage := Some(url("https://www.scala-sbt.org/"))
 
 homepage := Some(url("https://www.scala-sbt.org/sbt-site/"))
 
-crossSbtVersions := List("1.1.6")
+crossSbtVersions := List("1.4.9")
 
 licenses += ("BSD 3-Clause", url("https://opensource.org/licenses/BSD-3-Clause"))
 //#scm-info
@@ -18,7 +18,7 @@ scmInfo := Some(ScmInfo(url("https://github.com/sbt/sbt-site"), "scm:git:git@git
 
 scalacOptions ++= Seq("-deprecation", "-unchecked")
 
-resolvers += Resolver.sonatypeRepo("releases")
+resolvers ++= Resolver.sonatypeOssRepos("releases")
 
 val unfilteredVersion = "0.9.1"
 
@@ -39,8 +39,8 @@ addSbtPlugin("com.lightbend.paradox" % "sbt-paradox" % "0.5.5")
 libraryDependencies +=
   Defaults.sbtPluginExtra(
     "org.planet42" % "laika-sbt" % "0.8.0",
-    (sbtBinaryVersion in pluginCrossBuild).value,
-    (scalaBinaryVersion in pluginCrossBuild).value
+    (pluginCrossBuild / sbtBinaryVersion).value,
+    (pluginCrossBuild / scalaBinaryVersion).value
   )
 
 enablePlugins(ParadoxSitePlugin, ParadoxMaterialThemePlugin)
diff --git a/project/build.properties b/project/build.properties
index c0bab04..8b9a0b0 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.2.8
+sbt.version=1.8.0
diff --git a/src/main/paradox/index.md b/src/main/paradox/index.md
index 7e8cc35..c8c99ab 100644
--- a/src/main/paradox/index.md
+++ b/src/main/paradox/index.md
@@ -6,6 +6,7 @@ Before upgrading please consult the @github:[release notes](/notes/). Instructio
 
 @@@ note
 
+* Version 1.5+ is published for sbt >= 1.4.9.
 * Version 1.4+ is published for sbt 1.2.x.
 * Version 1.3+ is cross published to both sbt 0.13 and sbt 1.x.
 * As of sbt-site version 1.x.x, sbt version 0.13.10+ or 1.0.0-RC2+ is supported.
diff --git a/src/main/paradox/migration-guide.md b/src/main/paradox/migration-guide.md
index 4a539f7..61d20bc 100644
--- a/src/main/paradox/migration-guide.md
+++ b/src/main/paradox/migration-guide.md
@@ -14,7 +14,7 @@ Therefore when upgrading remove the `Paradox` configuration scope from all of th
 Note that sbt-site setting `siteSubdirName` is still configured under the `Paradox` configuration scope.
 
 The default Paradox source directory has been changed to match the one defined in the `sbt-paradox`, which is `src/main/paradox`.
-To keep the previous default, add the following to the build: `sourceDirectory in paradox := sourceDirectory.value`
+To keep the previous default, add the following to the build: `paradox / sourceDirectory := sourceDirectory.value`
 
 <a id="from-version-0.x.x-to-1.x.x" />
 ## Migrating from version 0.x.x to 1.x.x
diff --git a/src/main/scala/com/typesafe/sbt/SbtSite.scala b/src/main/scala/com/typesafe/sbt/SbtSite.scala
index 4db5e01..0ca02bf 100644
--- a/src/main/scala/com/typesafe/sbt/SbtSite.scala
+++ b/src/main/scala/com/typesafe/sbt/SbtSite.scala
@@ -6,7 +6,7 @@ import sbt.Keys
 /** Shim for backwards compatibility in `sbt-ghpages`*/
 object SbtSite {
   object SiteKeys {
-    @deprecated("Please upgrade to AutoPlugin and use `mappings in makeSite`", "1.0")
-    val siteMappings = Keys.mappings in SitePlugin.autoImport.makeSite
+    @deprecated("Please upgrade to AutoPlugin and use `makeSite / mappings`", "1.0")
+    val siteMappings = SitePlugin.autoImport.makeSite / Keys.mappings
   }
 }
diff --git a/src/main/scala/com/typesafe/sbt/site/Compat.scala b/src/main/scala/com/typesafe/sbt/site/Compat.scala
index be7ded5..1997f70 100644
--- a/src/main/scala/com/typesafe/sbt/site/Compat.scala
+++ b/src/main/scala/com/typesafe/sbt/site/Compat.scala
@@ -52,9 +52,9 @@ object Compat {
   def watchSettings(scope: Scope): Seq[Setting[_]] =
     Seq(
       ConfigGlobal / watchSources += new Source(
-        base = (sourceDirectory in scope).value,
-        includeFilter = (includeFilter in scope).value,
-        excludeFilter = (excludeFilter in scope).value
+        base = (scope / sourceDirectory).value,
+        includeFilter = (scope / includeFilter).value,
+        excludeFilter = (scope / excludeFilter).value
       )
     )
 
diff --git a/src/main/scala/com/typesafe/sbt/site/SiteKeys.scala b/src/main/scala/com/typesafe/sbt/site/SiteKeys.scala
index 636db6a..768e57c 100644
--- a/src/main/scala/com/typesafe/sbt/site/SiteKeys.scala
+++ b/src/main/scala/com/typesafe/sbt/site/SiteKeys.scala
@@ -12,8 +12,8 @@ trait SiteKeys {
   val packageSite = TaskKey[File]("package-site", "Create a zip file of the website.")
   val siteSubdirName = SettingKey[String]("siteSubdirName",
       "Name of subdirectory in site target directory to put generator plugin content. Defaults to empty string.")
-  val siteMappings = mappings in makeSite
-  val siteDirectory = target in makeSite
-  val siteSources = sources in makeSite
-  val siteSourceDirectory = sourceDirectory in makeSite
+  val siteMappings = makeSite / mappings
+  val siteDirectory = makeSite / target
+  val siteSources = makeSite / sources
+  val siteSourceDirectory = makeSite / sourceDirectory
 }
diff --git a/src/main/scala/com/typesafe/sbt/site/SitePlugin.scala b/src/main/scala/com/typesafe/sbt/site/SitePlugin.scala
index c23d842..b228f5e 100644
--- a/src/main/scala/com/typesafe/sbt/site/SitePlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/SitePlugin.scala
@@ -8,7 +8,7 @@ import sbt._
 object SitePlugin extends AutoPlugin {
   override def trigger = allRequirements
   object autoImport extends SiteKeys {
-    def publishSite(): SettingsDefinition = addArtifact(artifact in packageSite, packageSite)
+    def publishSite(): SettingsDefinition = addArtifact(packageSite / artifact, packageSite)
     val addMappingsToSiteDir = com.typesafe.sbt.site.util.SiteHelpers.addMappingsToSiteDir _
   }
   import autoImport._
@@ -18,11 +18,11 @@ object SitePlugin extends AutoPlugin {
     siteMappings := (siteMappings ?? Seq.empty).value,
     siteDirectory := target.value / "site",
     siteSourceDirectory := sourceDirectory.value / "site",
-    includeFilter in makeSite := "*.html" | "*.css" | "*.png" | "*.jpg" | "*.gif" | "*.js" | "*.swf",
-    siteMappings ++= SiteHelpers.selectSubpaths(siteSourceDirectory.value, (includeFilter in makeSite).value),
+    makeSite / includeFilter := "*.html" | "*.css" | "*.png" | "*.jpg" | "*.gif" | "*.js" | "*.swf",
+    siteMappings ++= SiteHelpers.selectSubpaths(siteSourceDirectory.value, (makeSite / includeFilter).value),
     makeSite := SiteHelpers.copySite(siteDirectory.value, streams.value.cacheDirectory, siteMappings.value),
-    artifact in packageSite := SiteHelpers.siteArtifact(moduleName.value),
-    artifactPath in packageSite := Defaults.artifactPathSetting(artifact in packageSite).value,
-    packageSite := SiteHelpers.createSiteZip(makeSite.value, (artifactPath in packageSite).value, streams.value)
+    packageSite / artifact := SiteHelpers.siteArtifact(moduleName.value),
+    packageSite / artifactPath := Defaults.artifactPathSetting(packageSite / artifact).value,
+    packageSite := SiteHelpers.createSiteZip(makeSite.value, (packageSite / artifactPath).value, streams.value)
   )
 }
diff --git a/src/main/scala/com/typesafe/sbt/site/SitePreviewPlugin.scala b/src/main/scala/com/typesafe/sbt/site/SitePreviewPlugin.scala
index 9344051..3f25405 100644
--- a/src/main/scala/com/typesafe/sbt/site/SitePreviewPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/SitePreviewPlugin.scala
@@ -12,9 +12,9 @@ object SitePreviewPlugin extends AutoPlugin {
   object autoImport {
     val previewSite = TaskKey[Unit]("previewSite", "Launches a jetty server that serves your generated site from the target directory")
     val previewAuto = TaskKey[Unit]("previewAuto", "Launches an automatic jetty server that serves your generated site from the target directory")
-    val previewFixedPort = SettingKey[Option[Int]]("previewFixedPort") in previewSite
-    val previewLaunchBrowser = SettingKey[Boolean]("previewLaunchBrowser") in previewSite
-    val previewPath = SettingKey[String]("previewPath", "path to open on `previewSite` and `previewAuto`") in previewSite
+    val previewFixedPort = previewSite / SettingKey[Option[Int]]("previewFixedPort")
+    val previewLaunchBrowser = previewSite / SettingKey[Boolean]("previewLaunchBrowser")
+    val previewPath = previewSite / SettingKey[String]("previewPath", "path to open on `previewSite` and `previewAuto`")
   }
 
   import SitePlugin.autoImport._
@@ -44,7 +44,7 @@ object SitePreviewPlugin extends AutoPlugin {
       val browser = previewLaunchBrowser.value
       val path = previewPath.value
 
-      Preview(port, (target in previewAuto).value, (thisProjectRef.value / makeSite), Compat.genSources, state.value).run { server =>
+      Preview(port, (previewAuto / target).value, (thisProjectRef.value / makeSite), Compat.genSources, state.value).run { server =>
         if (browser)
           Browser.open(server.portBindings.head.url + "/" + path)
       }
@@ -52,7 +52,7 @@ object SitePreviewPlugin extends AutoPlugin {
     previewFixedPort := Some(4000),
     previewLaunchBrowser := true,
     previewPath := "",
-    target in previewAuto := siteDirectory.value
+    previewAuto / target := siteDirectory.value
   )
 
   def createServer(siteTarget: File, port: Int) =
diff --git a/src/main/scala/com/typesafe/sbt/site/SiteScaladocPlugin.scala b/src/main/scala/com/typesafe/sbt/site/SiteScaladocPlugin.scala
index f01327a..5487c8a 100644
--- a/src/main/scala/com/typesafe/sbt/site/SiteScaladocPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/SiteScaladocPlugin.scala
@@ -18,7 +18,7 @@ object SiteScaladocPlugin extends AutoPlugin {
 
   def scaladocSettings(
     config: Configuration,
-    scaladocMappings: TaskKey[Seq[(File, String)]] = (mappings in (Compile, packageDoc)),
+    scaladocMappings: TaskKey[Seq[(File, String)]] = Compile / packageDoc / mappings,
     scaladocDir: String = "latest/api"
   ): Seq[Setting[_]] =
     inConfig(config)(
@@ -27,5 +27,5 @@ object SiteScaladocPlugin extends AutoPlugin {
         mappings := scaladocMappings.value
       )
     ) ++
-      SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+      SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 }
diff --git a/src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorPlugin.scala b/src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorPlugin.scala
index 5720340..55ae848 100644
--- a/src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/asciidoctor/AsciidoctorPlugin.scala
@@ -42,7 +42,7 @@ object AsciidoctorPlugin extends AutoPlugin {
     ) ++
       SiteHelpers.directorySettings(config) ++
       SiteHelpers.watchSettings(config) ++
-      SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+      SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 
   /** Run asciidoctor in new ClassLoader. */
   private[sbt] def generate(
diff --git a/src/main/scala/com/typesafe/sbt/site/gitbook/GitBookPlugin.scala b/src/main/scala/com/typesafe/sbt/site/gitbook/GitBookPlugin.scala
index 277d4a3..8933177 100644
--- a/src/main/scala/com/typesafe/sbt/site/gitbook/GitBookPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/gitbook/GitBookPlugin.scala
@@ -42,7 +42,7 @@ object GitBookPlugin extends AutoPlugin {
     ) ++
       SiteHelpers.directorySettings(config) ++
       SiteHelpers.watchSettings(config) ++
-      SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+      SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 
   /** Run gitbook commands. */
   private[sbt] def generate(src: File, target: File, inc: FileFilter, exc: FileFilter, installDir: Option[File], s: TaskStreams): Seq[(File, String)] = {
diff --git a/src/main/scala/com/typesafe/sbt/site/hugo/HugoPlugin.scala b/src/main/scala/com/typesafe/sbt/site/hugo/HugoPlugin.scala
index e5baaba..7b8f5d1 100644
--- a/src/main/scala/com/typesafe/sbt/site/hugo/HugoPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/hugo/HugoPlugin.scala
@@ -42,7 +42,7 @@ object HugoPlugin extends AutoPlugin {
     ) ++
       SiteHelpers.directorySettings(config) ++
       SiteHelpers.watchSettings(config) ++
-      SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+      SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 
   /** Run hugo via fork. */
   private[sbt] def generate(
@@ -74,4 +74,4 @@ object HugoPlugin extends AutoPlugin {
     } yield ()
   }
 
-}
\ No newline at end of file
+}
diff --git a/src/main/scala/com/typesafe/sbt/site/jekyll/JekyllPlugin.scala b/src/main/scala/com/typesafe/sbt/site/jekyll/JekyllPlugin.scala
index 4ff3b21..53351c7 100644
--- a/src/main/scala/com/typesafe/sbt/site/jekyll/JekyllPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/jekyll/JekyllPlugin.scala
@@ -35,7 +35,7 @@ object JekyllPlugin extends AutoPlugin {
     ) ++
       SiteHelpers.directorySettings(config) ++
       SiteHelpers.watchSettings(config) ++
-      SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+      SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 
   /** Run jekyll via fork. TODO - Add command line args and the like. */
   private[sbt] def generate(
diff --git a/src/main/scala/com/typesafe/sbt/site/laika/LaikaSitePlugin.scala b/src/main/scala/com/typesafe/sbt/site/laika/LaikaSitePlugin.scala
index 45ceb83..0373c43 100644
--- a/src/main/scala/com/typesafe/sbt/site/laika/LaikaSitePlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/laika/LaikaSitePlugin.scala
@@ -28,19 +28,19 @@ object LaikaSitePlugin extends AutoPlugin {
       inConfig(config)(
         Def.settings(
           LaikaPlugin.projectSettings,
-          target in laikaSite := target.value,
+          laikaSite / target := target.value,
           includeFilter := AllPassFilter,
           excludeFilter := HiddenFileFilter,
           mappings := {
             generate(laikaSite.value, includeFilter.value, excludeFilter.value)
           },
           siteSubdirName := "",
-          sourceDirectories in Laika := Seq(sourceDirectory.value)
+          Laika / sourceDirectories := Seq(sourceDirectory.value)
         )
       ) ++
         SiteHelpers.directorySettings(config) ++
         SiteHelpers.watchSettings(config) ++
-        SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+        SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 
   private def generate(target: File, inc: FileFilter, exc: FileFilter): Seq[(File, String)] = {
     // Figure out what was generated.
diff --git a/src/main/scala/com/typesafe/sbt/site/nanoc/NanocPlugin.scala b/src/main/scala/com/typesafe/sbt/site/nanoc/NanocPlugin.scala
index 5cff0e1..88e0706 100644
--- a/src/main/scala/com/typesafe/sbt/site/nanoc/NanocPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/nanoc/NanocPlugin.scala
@@ -36,7 +36,7 @@ object NanocPlugin extends AutoPlugin {
     ) ++
       SiteHelpers.directorySettings(config) ++
       SiteHelpers.watchSettings(config) ++
-      SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+      SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 
   /** Run nanoc via fork. TODO - Add command line args and the like. */
   private[sbt] def generate(
diff --git a/src/main/scala/com/typesafe/sbt/site/pamflet/PamfletPlugin.scala b/src/main/scala/com/typesafe/sbt/site/pamflet/PamfletPlugin.scala
index 02a44cd..2824351 100644
--- a/src/main/scala/com/typesafe/sbt/site/pamflet/PamfletPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/pamflet/PamfletPlugin.scala
@@ -23,14 +23,14 @@ object PamfletPlugin extends AutoPlugin {
       inConfig(config)(
         Seq(
           includeFilter := AllPassFilter,
-          pamfletFencePlugins := (pamfletFencePlugins in config).?.value.getOrElse(Nil),
+          pamfletFencePlugins := (config / pamfletFencePlugins).?.value.getOrElse(Nil),
           mappings := generate(sourceDirectory.value, target.value, includeFilter.value, pamfletFencePlugins.value),
           siteSubdirName := ""
         )
       ) ++
         SiteHelpers.directorySettings(config) ++
         SiteHelpers.watchSettings(config) ++
-        SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+        SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 
   /** Run pamflet in sbt's JVM. */
   private[sbt] def generate(
diff --git a/src/main/scala/com/typesafe/sbt/site/paradox/ParadoxSitePlugin.scala b/src/main/scala/com/typesafe/sbt/site/paradox/ParadoxSitePlugin.scala
index ad6b971..842962b 100644
--- a/src/main/scala/com/typesafe/sbt/site/paradox/ParadoxSitePlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/paradox/ParadoxSitePlugin.scala
@@ -22,9 +22,9 @@ object ParadoxSitePlugin extends AutoPlugin {
   def paradoxSettings(config: Configuration): Seq[Setting[_]] = {
     val siteNameConfig = if (config == Compile) Paradox else config
     List(
-      siteSubdirName in siteNameConfig := ""
+      siteNameConfig / siteSubdirName := ""
     ) ++
     SiteHelpers.watchSettings(ThisScope.in(config, paradox.key)) ++
-    SiteHelpers.addMappingsToSiteDir((paradox in config).map(SiteHelpers.selectSubpaths(_, AllPassFilter)), siteSubdirName in siteNameConfig)
+    SiteHelpers.addMappingsToSiteDir((config / paradox).map(SiteHelpers.selectSubpaths(_, AllPassFilter)), siteNameConfig / siteSubdirName)
   }
 }
diff --git a/src/main/scala/com/typesafe/sbt/site/preprocess/PreprocessPlugin.scala b/src/main/scala/com/typesafe/sbt/site/preprocess/PreprocessPlugin.scala
index 279f32b..73b12b8 100644
--- a/src/main/scala/com/typesafe/sbt/site/preprocess/PreprocessPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/preprocess/PreprocessPlugin.scala
@@ -36,7 +36,7 @@ object PreprocessPlugin extends AutoPlugin {
           ,
         preprocessVars := Map("VERSION" -> version.value),
         preprocessRules := Seq.empty,
-        includeFilter in Preprocess := AllPassFilter,
+        Preprocess / includeFilter := AllPassFilter,
         sourceDirectory := sourceDirectory.value / "site-preprocess",
         target := target.value / Preprocess.name,
         preprocess := simplePreprocess(
@@ -47,7 +47,7 @@ object PreprocessPlugin extends AutoPlugin {
       )
     ) ++
       SiteHelpers.watchSettings(config) ++
-      SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+      SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 
   /**
    * Simple preprocessing of all files in a directory using `@variable@` replacements.
diff --git a/src/main/scala/com/typesafe/sbt/site/sphinx/SphinxPlugin.scala b/src/main/scala/com/typesafe/sbt/site/sphinx/SphinxPlugin.scala
index e3e05f5..4e2d905 100644
--- a/src/main/scala/com/typesafe/sbt/site/sphinx/SphinxPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/site/sphinx/SphinxPlugin.scala
@@ -25,14 +25,14 @@ object SphinxPlugin extends AutoPlugin {
         sphinxProperties := Map.empty,
         sphinxEnv := Map.empty,
         sphinxIncremental := false,
-        includeFilter in generate := AllPassFilter,
-        excludeFilter in generate := HiddenFileFilter,
+        generate / includeFilter := AllPassFilter,
+        generate / excludeFilter := HiddenFileFilter,
         sphinxInputs := combineSphinxInputs.value,
         sphinxRunner := SphinxRunner(),
         installPackages := installPackagesTask.value,
-        enableOutput in generateHtml := true,
-        enableOutput in generatePdf := false,
-        enableOutput in generateEpub := false,
+        generateHtml / enableOutput := true,
+        generatePdf / enableOutput := false,
+        generateEpub / enableOutput := false,
         generateHtml := generateHtmlTask.value,
         generatePdf := generatePdfTask.value,
         generateEpub := generateEpubTask.value,
@@ -40,7 +40,7 @@ object SphinxPlugin extends AutoPlugin {
         generatedPdf := seqIfEnabled(generatePdf).value,
         generatedEpub := ifEnabled(generateEpub).value,
         generate := generateTask.value,
-        includeFilter in Sphinx := AllPassFilter,
+        Sphinx / includeFilter := AllPassFilter,
         mappings := mappingsTask.value,
         version := SiteHelpers.shortVersion(version.value),
         sphinxEnv := defaultEnvTask.value,
@@ -50,7 +50,7 @@ object SphinxPlugin extends AutoPlugin {
       propertiesSettings(config) ++
       SiteHelpers.directorySettings(config) ++
       SiteHelpers.watchSettings(config) ++
-      SiteHelpers.addMappingsToSiteDir(mappings in config, siteSubdirName in config)
+      SiteHelpers.addMappingsToSiteDir(config / mappings, config / siteSubdirName)
 
   def defaultEnvTask = installPackages map {
     pkgs => Map("PYTHONPATH" -> Path.makeString(pkgs))
@@ -58,8 +58,8 @@ object SphinxPlugin extends AutoPlugin {
 
   // For now, we default to passing the version in as a property.
   def propertiesSettings(config: Configuration) = Seq(
-    sphinxProperties in config ++= Map(
-      "version" → (version in config).value,
+    config / sphinxProperties ++= Map(
+      "version" → (config / version).value,
       "release" → version.value
     )
   )
@@ -75,8 +75,8 @@ object SphinxPlugin extends AutoPlugin {
   def combineSphinxInputs = Def.task {
     SphinxInputs(
       sourceDirectory.value,
-      (includeFilter in generate).value,
-      (excludeFilter in generate).value,
+      (generate / includeFilter).value,
+      (generate / excludeFilter).value,
       sphinxIncremental.value,
       sphinxTags.value,
       sphinxProperties.value,
@@ -118,7 +118,7 @@ object SphinxPlugin extends AutoPlugin {
     f: Task[S] => Task[T],
     nil: T): Def.Initialize[Task[T]] = Def.task{
     val t = key.taskValue
-    if ((enableOutput in key in key.scope).value) f(t) else task {nil}
+    if ((key.scope / key / enableOutput).value) f(t) else task {nil}
   }.flatMap(identity(_))
 
   def generateTask = Def.task {
@@ -137,7 +137,7 @@ object SphinxPlugin extends AutoPlugin {
       (epub ** "*.epub").get pair Path.rebase(epub, t)
     }
     val mapping = htmlMapping ++ pdfMapping ++ epubMapping
-    Sync(CacheStore(cache))(mapping)
+    Sync.sync(CacheStore(cache))(mapping)
     s.log.info("Sphinx documentation generated: %s" format t)
     t
   }
diff --git a/src/main/scala/com/typesafe/sbt/site/util/SiteHelpers.scala b/src/main/scala/com/typesafe/sbt/site/util/SiteHelpers.scala
index 8f6e134..57d0917 100644
--- a/src/main/scala/com/typesafe/sbt/site/util/SiteHelpers.scala
+++ b/src/main/scala/com/typesafe/sbt/site/util/SiteHelpers.scala
@@ -24,14 +24,14 @@ object SiteHelpers {
 
   def copySite(dir: File, cacheDir: File, maps: Seq[(File, String)]): File = {
     val concrete = maps map { case (file, dest) => (file, dir / dest) }
-    Sync(CacheStore(cacheDir / "make-site"))(concrete)
+    Sync.sync(CacheStore(cacheDir / "make-site"))(concrete)
     dir
   }
 
   def siteArtifact(name: String) = Artifact(name, Artifact.DocType, "zip", "site")
 
   def createSiteZip(siteDir: File, zipPath: File, s: TaskStreams): File = {
-    IO.zip(Path.allSubpaths(siteDir), zipPath)
+    IO.zip(Path.allSubpaths(siteDir), zipPath, Some(System.currentTimeMillis()))
     s.log.info("Site packaged: " + zipPath)
     zipPath
   }
diff --git a/src/sbt-test/asciidoctor/asciidoctor-skips-frontmatter/build.sbt b/src/sbt-test/asciidoctor/asciidoctor-skips-frontmatter/build.sbt
index 0108987..605ee2b 100644
--- a/src/sbt-test/asciidoctor/asciidoctor-skips-frontmatter/build.sbt
+++ b/src/sbt-test/asciidoctor/asciidoctor-skips-frontmatter/build.sbt
@@ -6,14 +6,14 @@ enablePlugins(AsciidoctorPlugin)
 
 //#siteSubdirName
 // Puts output in `target/site/asciimd`
-siteSubdirName in Asciidoctor := "asciimd"
-asciidoctorAttributes in Asciidoctor := Map(
+Asciidoctor / siteSubdirName := "asciimd"
+Asciidoctor / asciidoctorAttributes := Map(
   "skip-front-matter" -> "", // skip-front-matter is a flag that just has to be present.
   "lang" -> "nl")
 //#siteSubdirName
 
 TaskKey[Unit]("checkContent") := {
-  val dest = (target in makeSite).value / (siteSubdirName in Asciidoctor).value
+  val dest = (makeSite / target).value / (Asciidoctor / siteSubdirName).value
   val index = dest / "index.html"
   assert(index.exists, s"${index.getAbsolutePath} did not exist")
   val content = IO.readLines(index)
diff --git a/src/sbt-test/asciidoctor/can-use-asciidoctor/build.sbt b/src/sbt-test/asciidoctor/can-use-asciidoctor/build.sbt
index 02f2b13..74eb645 100644
--- a/src/sbt-test/asciidoctor/can-use-asciidoctor/build.sbt
+++ b/src/sbt-test/asciidoctor/can-use-asciidoctor/build.sbt
@@ -6,11 +6,11 @@ enablePlugins(AsciidoctorPlugin)
 
 //#siteSubdirName
 // Puts output in `target/site/asciimd`
-siteSubdirName in Asciidoctor := "asciimd"
+Asciidoctor / siteSubdirName := "asciimd"
 //#siteSubdirName
 
 TaskKey[Unit]("checkContent") := {
-  val dest = (target in makeSite).value / (siteSubdirName in Asciidoctor).value
+  val dest = (makeSite / target).value / (Asciidoctor / siteSubdirName).value
   val index = dest / "index.html"
   assert(index.exists, s"${index.getAbsolutePath} did not exist")
   val diagram = dest / "asciidoctor-diagram-process.png"
diff --git a/src/sbt-test/laika/blog-post/project/build.properties b/src/sbt-test/laika/blog-post/project/build.properties
index c0bab04..dbae93b 100644
--- a/src/sbt-test/laika/blog-post/project/build.properties
+++ b/src/sbt-test/laika/blog-post/project/build.properties
@@ -1 +1 @@
-sbt.version=1.2.8
+sbt.version=1.4.9
diff --git a/src/sbt-test/laika/minimal/project/build.properties b/src/sbt-test/laika/minimal/project/build.properties
index c0bab04..dbae93b 100644
--- a/src/sbt-test/laika/minimal/project/build.properties
+++ b/src/sbt-test/laika/minimal/project/build.properties
@@ -1 +1 @@
-sbt.version=1.2.8
+sbt.version=1.4.9
diff --git a/src/sbt-test/site/minimum-sbt-1.0/project/build.properties b/src/sbt-test/site/minimum-sbt-1.0/project/build.properties
index de64a8f..86af17f 100644
--- a/src/sbt-test/site/minimum-sbt-1.0/project/build.properties
+++ b/src/sbt-test/site/minimum-sbt-1.0/project/build.properties
@@ -1,2 +1,2 @@
 # When updating also change the minimum version noted in src/main/paradox/index.md
-sbt.version=1.2.8
+sbt.version=1.4.9
diff --git a/src/sbt-test/site/plays-nice-with-ghpages/project/plugins.sbt b/src/sbt-test/site/plays-nice-with-ghpages/project/plugins.sbt
index 1e01c4b..2bf1ef2 100644
--- a/src/sbt-test/site/plays-nice-with-ghpages/project/plugins.sbt
+++ b/src/sbt-test/site/plays-nice-with-ghpages/project/plugins.sbt
@@ -1,5 +1,5 @@
 addSbtPlugin("com.typesafe.sbt" % "sbt-site" % sys.props("project.version"))
 
-resolvers += "jgit-repo" at "http://download.eclipse.org/jgit/maven"
+resolvers += "jgit-repo" at "https://download.eclipse.org/jgit/maven"
 
 addSbtPlugin("com.typesafe.sbt" % "sbt-ghpages" % "0.6.2")
diff --git a/src/sbt-test/site/plays-nice-with-tut/project/build.properties b/src/sbt-test/site/plays-nice-with-tut/project/build.properties
index c0bab04..dbae93b 100644
--- a/src/sbt-test/site/plays-nice-with-tut/project/build.properties
+++ b/src/sbt-test/site/plays-nice-with-tut/project/build.properties
@@ -1 +1 @@
-sbt.version=1.2.8
+sbt.version=1.4.9