diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 22985df4..d2b54942 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
       fail-fast: false
       matrix:
         java: ['adopt@1.8', 'adopt@1.11']
-        scala: ['2.12.17', '2.13.10', '3.3.0']
+        scala: ['2.12.19', '2.13.13', '3.3.3']
         platform: ['JVM', 'JS']
     steps:
       - name: Checkout current branch
@@ -45,10 +45,10 @@ jobs:
       - name: Cache scala dependencies
         uses: coursier/cache-action@v5
       - name: Run tests
-        if: matrix.scala != '3.3.0'
+        if: matrix.scala != '3.3.3'
         run: sbt ++${{ matrix.scala }}! test${{ matrix.platform }}
       - name: Run dotty tests
-        if: matrix.scala == '3.3.0' && matrix.platform == 'JVM'
+        if: matrix.scala == '3.3.3' && matrix.platform == 'JVM'
         run: sbt ++${{ matrix.scala }}! testJVM
 
   ci:
diff --git a/build.sbt b/build.sbt
index 383e520a..4904cbb0 100644
--- a/build.sbt
+++ b/build.sbt
@@ -51,12 +51,12 @@ lazy val root = project
     unusedCompileDependenciesFilter -= moduleFilter("org.scala-js", "scalajs-library")
   )
 
-val zioVersion                 = "2.0.21"
+val zioVersion                 = "2.0.22"
 val catsVersion                = "2.9.0"
-val catsEffectVersion          = "3.5.3"
+val catsEffectVersion          = "3.5.4"
 val catsMtlVersion             = "1.3.0"
 val disciplineScalaTestVersion = "2.2.0"
-val fs2Version                 = "3.9.4"
+val fs2Version                 = "3.10.2"
 val scalaJavaTimeVersion       = "2.5.0"
 
 lazy val zioInteropTracer = crossProject(JSPlatform, JVMPlatform)
diff --git a/core-only-test/shared/src/test/scala/zio/interop/test/CoreSummonSpec.scala b/core-only-test/shared/src/test/scala/zio/interop/test/CoreSummonSpec.scala
index 77492baa..564d5211 100644
--- a/core-only-test/shared/src/test/scala/zio/interop/test/CoreSummonSpec.scala
+++ b/core-only-test/shared/src/test/scala/zio/interop/test/CoreSummonSpec.scala
@@ -10,7 +10,7 @@ import zio.stream.{ Stream, ZStream }
 import zio.test.*
 
 object CoreSummonSpec extends ZIOSpecDefault {
-  override def spec =
+  override def spec: Spec[Any, Throwable] =
     suite("summons from catz.core work with only a cats-core dependency")(
       test("ZIO instances") {
         val monad      = implicitly[Monad[UIO]]
diff --git a/project/BuildHelper.scala b/project/BuildHelper.scala
index a50916a0..e30569c9 100644
--- a/project/BuildHelper.scala
+++ b/project/BuildHelper.scala
@@ -9,9 +9,9 @@ import BuildInfoKeys._
 object BuildHelper {
   val testDeps = Seq("org.scalacheck" %% "scalacheck" % "1.17.0" % Test)
 
-  val Scala212 = "2.12.17"
-  val Scala213 = "2.13.10"
-  val Scala3   = "3.3.0"
+  val Scala212 = "2.12.19"
+  val Scala213 = "2.13.13"
+  val Scala3   = "3.3.3"
 
   private val stdOptions = Seq(
     "-deprecation",
@@ -92,7 +92,7 @@ object BuildHelper {
     scalacOptions ++= stdOptions ++ extraOptions(scalaVersion.value, optimize = !isSnapshot.value),
     libraryDependencies ++= testDeps ++ {
       if (isDotty(scalaVersion.value)) Seq.empty
-      else Seq(compilerPlugin("org.typelevel" % "kind-projector" % "0.13.2") cross CrossVersion.full)
+      else Seq(compilerPlugin("org.typelevel" % "kind-projector" % "0.13.3") cross CrossVersion.full)
     },
     Test / parallelExecution := true,
     incOptions ~= (_.withLogRecompileOnMacro(false)),
diff --git a/project/build.properties b/project/build.properties
index 46e43a97..04267b14 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.8.2
+sbt.version=1.9.9
diff --git a/zio-interop-cats-tests/jvm/src/test/scala/zio/internal/stacktracer/InteropTracerSpec.scala b/zio-interop-cats-tests/jvm/src/test/scala/zio/internal/stacktracer/InteropTracerSpec.scala
index 4809cc77..c5e5b7a9 100644
--- a/zio-interop-cats-tests/jvm/src/test/scala/zio/internal/stacktracer/InteropTracerSpec.scala
+++ b/zio-interop-cats-tests/jvm/src/test/scala/zio/internal/stacktracer/InteropTracerSpec.scala
@@ -5,8 +5,8 @@ import zio.Trace
 
 object InteropTracerSpec extends ZIOSpecDefault {
 
-  private val myLambda: () => Any = () => ()
-  override def spec               =
+  private val myLambda: () => Any         = () => ()
+  override def spec: Spec[Any, Throwable] =
     suite("InteropTracerSpec")(
       test("lambda tracing") {
 
diff --git a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/CatsInteropSpec.scala b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/CatsInteropSpec.scala
index cf27333b..f83c3c00 100644
--- a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/CatsInteropSpec.scala
+++ b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/CatsInteropSpec.scala
@@ -7,7 +7,7 @@ import zio.test.*
 import zio.*
 
 object CatsInteropSpec extends CatsRunnableSpec {
-  def spec = suite("Cats interop")(
+  def spec: Spec[Any, Throwable] = suite("Cats interop")(
     test("cats fiber wrapped in Resource can be canceled") {
       for {
         promise <- Promise.make[Nothing, Int]
diff --git a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/CatsZManagedSyntaxSpec.scala b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/CatsZManagedSyntaxSpec.scala
index ad70d8a0..74033e68 100644
--- a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/CatsZManagedSyntaxSpec.scala
+++ b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/CatsZManagedSyntaxSpec.scala
@@ -12,7 +12,7 @@ import scala.collection.mutable
 
 object CatsZManagedSyntaxSpec extends CatsRunnableSpec {
 
-  def spec =
+  def spec: Spec[Any, Throwable] =
     suite("CatsZManagedSyntaxSpec")(
       suite("toManaged")(
         test("calls finalizers correctly when use is externally interrupted") {
diff --git a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/Fs2ZioSpec.scala b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/Fs2ZioSpec.scala
index 498ac49c..c428737d 100644
--- a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/Fs2ZioSpec.scala
+++ b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/Fs2ZioSpec.scala
@@ -10,7 +10,7 @@ import zio.test.*
 import zio.test.interop.catz.test.*
 
 object Fs2ZioSpec extends CatsRunnableSpec {
-  def spec =
+  def spec: Spec[Any, Throwable] =
     suite("ZIO with Fs2")(
       suite("fs2 parJoin")(
         testF("works if F is cats.effect.IO") {
diff --git a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/catzQueueSpec.scala b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/catzQueueSpec.scala
index dfe7acdf..7aa14fdb 100644
--- a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/catzQueueSpec.scala
+++ b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/catzQueueSpec.scala
@@ -40,7 +40,7 @@ object catzQueueSpec extends CatsRunnableSpec {
       actual  <- q.takeAll
     } yield assert(actual)(equalTo(expected.toList))
 
-  def spec = suite("catzQueueSpec")(
+  def spec: Spec[Any, Throwable] = suite("catzQueueSpec")(
     testF("can use a bounded queue from Cats Effect IO")(boundedQueueTest[CIO]),
     testF("can use a dropping queue from Cats Effect IO")(droppingQueueTest[CIO]),
     testF("can use a sliding queue from Cats Effect IO")(slidingQueueTest[CIO]),
diff --git a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/fs2StreamSpec.scala b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/fs2StreamSpec.scala
index 99870c38..920c0d7d 100644
--- a/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/fs2StreamSpec.scala
+++ b/zio-interop-cats-tests/jvm/src/test/scala/zio/interop/fs2StreamSpec.scala
@@ -28,7 +28,7 @@ object fs2StreamSpec extends ZIOSpecDefault {
       y <- expected.runCollect
     } yield assert(x)(equalTo(y))
 
-  def spec = suite("zio.stream.ZStream <-> fs2.Stream")(
+  def spec: Spec[Any, Throwable] = suite("zio.stream.ZStream <-> fs2.Stream")(
     suite("test toFs2Stream conversion")(
       test("simple stream")(check(Gen.chunkOf(Gen.int)) { (chunk: Chunk[Int]) =>
         assertEqual(ZStream.fromChunk(chunk).toFs2Stream, fs2StreamFromChunk(chunk))
diff --git a/zio-test-interop-cats/shared/src/test/scala/zio/test/interop/CatsRunnableSpec.scala b/zio-test-interop-cats/shared/src/test/scala/zio/test/interop/CatsRunnableSpec.scala
index 29a525a6..475f4dd9 100644
--- a/zio-test-interop-cats/shared/src/test/scala/zio/test/interop/CatsRunnableSpec.scala
+++ b/zio-test-interop-cats/shared/src/test/scala/zio/test/interop/CatsRunnableSpec.scala
@@ -32,15 +32,15 @@ abstract class CatsRunnableSpec extends ZIOSpecDefault {
   Unsafe.unsafe { implicit u =>
     runtime.unsafe.runToFuture {
       ZIO.fromFuture { implicit ec =>
-        Dispatcher.parallel[CIO].allocated.unsafeToFuture().andThen { case Success((dispatcher, close)) =>
-          openDispatcher = dispatcher
+        Dispatcher.parallel[CIO].allocated.unsafeToFuture().andThen { case Success((disp, close)) =>
+          openDispatcher = disp
           closeDispatcher = close
         }
       }.orDie
     }
   }
 
-  override val aspects = Chunk(
+  override val aspects: Chunk[TestAspect[Nothing, Any, Nothing, Any]] = Chunk(
     TestAspect.timeout(1.minute),
     TestAspect.afterAll(ZIO.fromFuture(_ => closeDispatcher.unsafeToFuture()).orDie)
   )