diff --git a/main-actions/src/test/scala/sbt/CacheIvyTest.scala b/main-actions/src/test/scala/sbt/CacheIvyTest.scala
index 64ebe5507..963f97c51 100644
--- a/main-actions/src/test/scala/sbt/CacheIvyTest.scala
+++ b/main-actions/src/test/scala/sbt/CacheIvyTest.scala
@@ -38,7 +38,7 @@ class CacheIvyTest extends Properties("CacheIvy") {
       content = converter.toJsonUnsafe(value)
   }
 
-  private def testCache[T: JsonFormat, U](
+  private def testCache[T, U](
       f: (SingletonCache[T], CacheStore) => U
   )(using cache: SingletonCache[T]): U = {
     val store = new InMemoryStore(Converter)
diff --git a/main-settings/src/main/scala/sbt/Def.scala b/main-settings/src/main/scala/sbt/Def.scala
index 63f62a043..2f12d4e7f 100644
--- a/main-settings/src/main/scala/sbt/Def.scala
+++ b/main-settings/src/main/scala/sbt/Def.scala
@@ -298,7 +298,7 @@ object Def extends BuildSyntax with Init with InitializeImplicits:
     )
   }
 
-  inline def cachedTask[A1: JsonFormat](inline a1: A1): Def.Initialize[Task[A1]] =
+  inline def cachedTask[A1](inline a1: A1): Def.Initialize[Task[A1]] =
     ${ TaskMacro.taskMacroImpl[A1]('a1, cached = true) }
 
   inline def task[A1](inline a1: A1): Def.Initialize[Task[A1]] =
diff --git a/main/src/main/scala/sbt/internal/Compiler.scala b/main/src/main/scala/sbt/internal/Compiler.scala
index f306b4fec..706ed5694 100644
--- a/main/src/main/scala/sbt/internal/Compiler.scala
+++ b/main/src/main/scala/sbt/internal/Compiler.scala
@@ -165,8 +165,7 @@ object Compiler:
       state: State,
       topLoader: ClassLoader,
   ): ScalaInstance =
-    import sbt.State.*
-    val classLoaderCache = state.extendedClassLoaderCache
+    val classLoaderCache = State.StateOpsImpl(state).extendedClassLoaderCache
     val compilerJars = allCompilerJars.filterNot(libraryJars.contains).distinct.toArray
     val docJars = allDocJars
       .filterNot(jar => libraryJars.contains(jar) || compilerJars.contains(jar))
diff --git a/main/src/main/scala/sbt/internal/InMemoryCacheStore.scala b/main/src/main/scala/sbt/internal/InMemoryCacheStore.scala
index 66b2b219d..5f0359952 100644
--- a/main/src/main/scala/sbt/internal/InMemoryCacheStore.scala
+++ b/main/src/main/scala/sbt/internal/InMemoryCacheStore.scala
@@ -27,12 +27,10 @@ private[sbt] object InMemoryCacheStore {
       .maximumWeight(maxSize)
       .weigher(weigher)
       .build()
-    def get[T](path: Path): Option[(T, Long)] = {
-      files.getIfPresent(path) match {
-        case null                                   => None
-        case (value: T @unchecked, lastModified, _) => Some((value, lastModified))
-      }
-    }
+    def get[A1](path: Path): Option[(A1, Long)] =
+      files.getIfPresent(path) match
+        case null                     => None
+        case (value, lastModified, _) => Some((value.asInstanceOf[A1], lastModified))
     def put(path: Path, value: Any, lastModified: Long): Unit = {
       try {
         if (lastModified > 0) {
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 4c49f44eb..cb80e1497 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -4,7 +4,7 @@ import Keys.*
 object Dependencies {
   // WARNING: Please Scala update versions in PluginCross.scala too
   val scala213 = "2.13.16"
-  val scala3 = "3.6.4"
+  val scala3 = "3.7.0"
   val checkPluginCross = settingKey[Unit]("Make sure scalaVersion match up")
   val baseScalaVersion = scala3
   def nightlyVersion: Option[String] =
diff --git a/sbt-app/src/sbt-test/actions/input-task-dyn/build.sbt b/sbt-app/src/sbt-test/actions/input-task-dyn/build.sbt
index f730e5919..7fa6ddece 100644
--- a/sbt-app/src/sbt-test/actions/input-task-dyn/build.sbt
+++ b/sbt-app/src/sbt-test/actions/input-task-dyn/build.sbt
@@ -5,7 +5,7 @@ import complete.Parser
 val runFoo = inputKey[Unit]("Runs Foo with passed arguments")
 val check = taskKey[Unit]("")
 
-scalaVersion := "3.6.4"
+scalaVersion := "3.7.0"
 
 lazy val root = (project in file(".")).
   settings(
diff --git a/sbt-app/src/sbt-test/cache/cached-compile/build.sbt b/sbt-app/src/sbt-test/cache/cached-compile/build.sbt
index 0b0bb3f4b..557a646f2 100644
--- a/sbt-app/src/sbt-test/cache/cached-compile/build.sbt
+++ b/sbt-app/src/sbt-test/cache/cached-compile/build.sbt
@@ -4,7 +4,7 @@ lazy val checkMiss = taskKey[Unit]("")
 
 Global / localCacheDirectory := baseDirectory.value / "diskcache"
 
-scalaVersion := "3.6.4"
+scalaVersion := "3.7.0"
 checkMiss := {
   val s = streams.value
   val config = Def.cacheConfiguration.value
diff --git a/sbt-app/src/sbt-test/cache/cached-test/build.sbt b/sbt-app/src/sbt-test/cache/cached-test/build.sbt
index 922abb89c..c6de7d205 100644
--- a/sbt-app/src/sbt-test/cache/cached-test/build.sbt
+++ b/sbt-app/src/sbt-test/cache/cached-test/build.sbt
@@ -5,7 +5,7 @@ lazy val verify = "com.eed3si9n.verify" %% "verify" % "1.0.0"
 
 Global / localCacheDirectory := baseDirectory.value / "diskcache"
 
-scalaVersion := "3.6.4"
+scalaVersion := "3.7.0"
 libraryDependencies += verify % Test
 testFrameworks += new TestFramework("verify.runner.Framework")
 
diff --git a/sbt-app/src/sbt-test/project/nested-macro/build.sbt b/sbt-app/src/sbt-test/project/nested-macro/build.sbt
index a6d00c01d..8cd03bacc 100644
--- a/sbt-app/src/sbt-test/project/nested-macro/build.sbt
+++ b/sbt-app/src/sbt-test/project/nested-macro/build.sbt
@@ -1,6 +1,6 @@
 lazy val a1 = settingKey[Boolean]("")
 
-scalaVersion := "3.6.4"
+scalaVersion := "3.7.0"
 a1 := true
 
 Compile / sourceGenerators += {
diff --git a/sbt-app/src/sbt-test/tests/incremental-object-deps/build.sbt b/sbt-app/src/sbt-test/tests/incremental-object-deps/build.sbt
index d37f0123e..cb3ac4205 100644
--- a/sbt-app/src/sbt-test/tests/incremental-object-deps/build.sbt
+++ b/sbt-app/src/sbt-test/tests/incremental-object-deps/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "3.6.4"
+scalaVersion := "3.7.0"
 libraryDependencies += "com.eed3si9n.verify" %% "verify" % "1.0.0" % Test
 testFrameworks += new TestFramework("verify.runner.Framework")
diff --git a/server-test/src/server-test/client/build.sbt b/server-test/src/server-test/client/build.sbt
index 36a9a9ab0..2b3f2477f 100644
--- a/server-test/src/server-test/client/build.sbt
+++ b/server-test/src/server-test/client/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "3.6.4"
+scalaVersion := "3.7.0"
 
 TaskKey[Unit]("willSucceed") := println("success")
 
diff --git a/tasks-standard/src/main/scala/sbt/std/TaskExtra.scala b/tasks-standard/src/main/scala/sbt/std/TaskExtra.scala
index f198fad22..ceffdedb4 100644
--- a/tasks-standard/src/main/scala/sbt/std/TaskExtra.scala
+++ b/tasks-standard/src/main/scala/sbt/std/TaskExtra.scala
@@ -9,6 +9,7 @@
 package sbt
 package std
 
+import scala.annotation.nowarn
 import scala.sys.process.{ BasicIO, ProcessIO, ProcessBuilder }
 
 import sbt.internal.util.AttributeMap
@@ -205,7 +206,10 @@ trait TaskExtra extends TaskExtra0 {
 
   extension [Key](
       in: Task[?]
-  )(using streams: Task[TaskStreams[Key]], key: Task[?] => Key) {
+  )(using
+      @nowarn("msg=unused") streams: Task[TaskStreams[Key]],
+      @nowarn("msg=unused") key: Task[?] => Key
+  ) {
     def binary[T](f: BufferedInputStream => T): Task[T] = pipeBinary(None, f)
     def binary[T](sid: String)(f: BufferedInputStream => T): Task[T] = pipeBinary(Some(sid), f)
 
diff --git a/util-cache/src/main/scala/sbt/util/ActionCache.scala b/util-cache/src/main/scala/sbt/util/ActionCache.scala
index 60252e3a3..ee554a10b 100644
--- a/util-cache/src/main/scala/sbt/util/ActionCache.scala
+++ b/util-cache/src/main/scala/sbt/util/ActionCache.scala
@@ -34,7 +34,7 @@ object ActionCache:
    * - config: The configuration that's used to store where the cache backends are.
    * - action: The actual action to be cached.
    */
-  def cache[I: HashWriter, O: JsonFormat: ClassTag](
+  def cache[I: HashWriter, O: JsonFormat](
       key: I,
       codeContentHash: Digest,
       extraHash: Digest,
@@ -81,7 +81,7 @@ object ActionCache:
   /**
    * Retrieves the cached value.
    */
-  def get[I: HashWriter, O: JsonFormat: ClassTag](
+  def get[I: HashWriter, O: JsonFormat](
       key: I,
       codeContentHash: Digest,
       extraHash: Digest,
diff --git a/util-cache/src/main/scala/sbt/util/SeparatedCache.scala b/util-cache/src/main/scala/sbt/util/SeparatedCache.scala
index 3fa11229c..53682274f 100644
--- a/util-cache/src/main/scala/sbt/util/SeparatedCache.scala
+++ b/util-cache/src/main/scala/sbt/util/SeparatedCache.scala
@@ -12,6 +12,7 @@ import scala.util.Try
 
 import sjsonnew.JsonFormat
 import sjsonnew.support.murmurhash.Hasher
+import scala.annotation.nowarn
 
 import CacheImplicits.*
 
@@ -37,6 +38,7 @@ object SingletonCache {
     }
 
   /** A lazy `SingletonCache` */
+  @nowarn("msg=unused")
   def lzy[A: JsonFormat](mkCache: => SingletonCache[A]): SingletonCache[A] =
     new SingletonCache[A] {
       lazy val cache = mkCache
diff --git a/util-tracking/src/main/scala/sbt/util/Tracked.scala b/util-tracking/src/main/scala/sbt/util/Tracked.scala
index 0c340dde0..b2e7ca8a4 100644
--- a/util-tracking/src/main/scala/sbt/util/Tracked.scala
+++ b/util-tracking/src/main/scala/sbt/util/Tracked.scala
@@ -16,6 +16,7 @@ import sbt.internal.util.EmptyCacheError
 
 import sjsonnew.{ JsonFormat, JsonWriter }
 import sjsonnew.support.murmurhash.Hasher
+import scala.annotation.nowarn
 
 object Tracked {
 
@@ -199,6 +200,7 @@ object Tracked {
    * cachedDoc(inputs)(() => exists(outputDirectory.allPaths.get.toSet))
    * }}}
    */
+  @nowarn("msg=unused")
   def inputChanged[I: JsonFormat: SingletonCache, O](store: CacheStore)(
       f: (Boolean, I) => O
   ): I => O =