diff --git a/api/src/test/scala/slog4s/EffectTest.scala b/api/src/test/scala/slog4s/EffectTest.scala
index 991933a..a758782 100644
--- a/api/src/test/scala/slog4s/EffectTest.scala
+++ b/api/src/test/scala/slog4s/EffectTest.scala
@@ -1,17 +1,18 @@
 package slog4s
 
 import cats.effect.syntax.all._
-import cats.effect.{ConcurrentEffect, Sync, Timer}
+import cats.effect.{ConcurrentEffect, Sync}
 import cats.syntax.flatMap._
 import org.scalactic.source
 import org.scalatest.funspec.FixtureAnyFunSpec
 
 import scala.concurrent.duration._
+import cats.effect.Temporal
 
 abstract class EffectTest[F[_]] extends FixtureAnyFunSpec {
 
   protected def asEffect(fixtureParam: FixtureParam): ConcurrentEffect[F]
-  protected def asTimer(fixtureParam: FixtureParam): Timer[F]
+  protected def asTimer(fixtureParam: FixtureParam): Temporal[F]
   protected def timeout: FiniteDuration = 10.seconds
 
   def it_(
diff --git a/api/src/test/scala/slog4s/MockClock.scala b/api/src/test/scala/slog4s/MockClock.scala
index 4c84be4..0ed7b6b 100644
--- a/api/src/test/scala/slog4s/MockClock.scala
+++ b/api/src/test/scala/slog4s/MockClock.scala
@@ -3,12 +3,12 @@ package slog4s
 import java.util.concurrent.TimeUnit
 
 import cats.Monad
-import cats.effect.concurrent.Ref
 import cats.effect.{Clock, Sync}
 import cats.syntax.flatMap._
 import cats.syntax.functor._
 
 import scala.concurrent.duration.Duration
+import cats.effect.Ref
 
 class MockClock[F[_]](val real: Ref[F, Long], val mono: Ref[F, Long])(implicit
     F: Monad[F]
diff --git a/console/src/main/scala/slog4s/console/internal/LoggingRuntimeImpl.scala b/console/src/main/scala/slog4s/console/internal/LoggingRuntimeImpl.scala
index d313423..956d2d6 100644
--- a/console/src/main/scala/slog4s/console/internal/LoggingRuntimeImpl.scala
+++ b/console/src/main/scala/slog4s/console/internal/LoggingRuntimeImpl.scala
@@ -1,11 +1,11 @@
 package slog4s.console.internal
 
-import cats.effect.concurrent.Semaphore
 import cats.effect.{Clock, Concurrent, Sync}
 import cats.syntax.functor._
 import slog4s.console.ConsoleConfig
 import slog4s.shared.{AsContext, LoggingRuntime}
 import slog4s.{Logger, LoggerFactory, LoggingContext, StructureBuilder}
+import cats.effect.std.Semaphore
 
 private[console] class LoggingRuntimeImpl[F[
     _
diff --git a/console/src/main/scala/slog4s/console/internal/SyncFormatter.scala b/console/src/main/scala/slog4s/console/internal/SyncFormatter.scala
index 83d7893..e8beb09 100644
--- a/console/src/main/scala/slog4s/console/internal/SyncFormatter.scala
+++ b/console/src/main/scala/slog4s/console/internal/SyncFormatter.scala
@@ -2,8 +2,8 @@ package slog4s.console.internal
 
 import java.time.Instant
 
-import cats.effect.concurrent.Semaphore
 import slog4s.{Level, Location}
+import cats.effect.std.Semaphore
 
 private[console] class SyncFormatter[F[_], T](
     semaphore: Semaphore[F],
diff --git a/console/src/test/scala/slog4s/console/ConsoleConfigTest.scala b/console/src/test/scala/slog4s/console/ConsoleConfigTest.scala
index d2d7a12..c2ee83b 100644
--- a/console/src/test/scala/slog4s/console/ConsoleConfigTest.scala
+++ b/console/src/test/scala/slog4s/console/ConsoleConfigTest.scala
@@ -1,6 +1,6 @@
 package slog4s.console
 
-import cats.effect.{ConcurrentEffect, ContextShift, IO, Timer}
+import cats.effect.{ConcurrentEffect, IO}
 import cats.syntax.functor._
 import cats.syntax.flatMap._
 import org.scalactic.source.Position
@@ -9,19 +9,20 @@ import slog4s.{EffectTest, Level}
 import slog4s.console.ConsoleConfigTest.Fixture
 
 import scala.concurrent.ExecutionContext
+import cats.effect.Temporal
 
 class ConsoleConfigTest extends EffectTest[IO] {
   override protected def asEffect(
       fixtureParam: FixtureParam
   ): ConcurrentEffect[IO] = fixtureParam.F
 
-  override protected def asTimer(fixtureParam: FixtureParam): Timer[IO] =
+  override protected def asTimer(fixtureParam: FixtureParam): Temporal[IO] =
     fixtureParam.timer
 
   override protected def withFixture(test: OneArgTest): Outcome = {
     implicit val contextShift: ContextShift[IO] =
       IO.contextShift(ExecutionContext.global)
-    implicit val timer: Timer[IO] = IO.timer(ExecutionContext.global)
+    implicit val timer: Temporal[IO] = IO.timer(ExecutionContext.global)
     test(new Fixture[IO]())
   }
 
@@ -57,7 +58,7 @@ object ConsoleConfigTest {
   import org.scalatest.matchers.should.Matchers._
   class Fixture[F[_]](implicit
       val F: ConcurrentEffect[F],
-      val timer: Timer[F]
+      val timer: Temporal[F]
   ) {
     def validateLevel(
         fLevel: F[Level]
diff --git a/console/src/test/scala/slog4s/console/ConsoleLoggerTest.scala b/console/src/test/scala/slog4s/console/ConsoleLoggerTest.scala
index 74c107d..e55cfdd 100644
--- a/console/src/test/scala/slog4s/console/ConsoleLoggerTest.scala
+++ b/console/src/test/scala/slog4s/console/ConsoleLoggerTest.scala
@@ -2,8 +2,7 @@ package slog4s.console
 
 import java.io.{ByteArrayOutputStream, PrintStream}
 import java.util.concurrent.{Executors, ThreadFactory}
-import cats.effect.concurrent.Ref
-import cats.effect.{ConcurrentEffect, ContextShift, IO, Resource, Sync, Timer}
+import cats.effect.{ConcurrentEffect, IO, Resource, Sync}
 import cats.syntax.all._
 import slog4s.Location.Code
 import slog4s.console.ConsoleLoggerTest.{Fixture, Output}
@@ -16,13 +15,14 @@ import slog4s.shared.{
 import slog4s._
 
 import scala.concurrent.ExecutionContext
+import cats.effect.{ Ref, Temporal }
 
 abstract class ConsoleLoggerTest[F[_]](format: Format) extends EffectTest[F] {
   override protected def asEffect(
       fixtureParam: FixtureParam
   ): ConcurrentEffect[F] = fixtureParam.F
 
-  override protected def asTimer(fixtureParam: FixtureParam): Timer[F] =
+  override protected def asTimer(fixtureParam: FixtureParam): Temporal[F] =
     fixtureParam.T
 
   override type FixtureParam = ConsoleLoggerTest.Fixture[F]
@@ -46,7 +46,7 @@ abstract class ConsoleLoggerTest[F[_]](format: Format) extends EffectTest[F] {
       implicit val contextShift: ContextShift[IO] = IO.contextShift(ec)
       implicit val F: Sync[IO] = ConcurrentEffect[IO]
       implicit val mockClock: MockClock[IO] = MockClock.make[IO].unsafeRunSync()
-      implicit val timer: Timer[IO] = IO.timer(ec)
+      implicit val timer: Temporal[IO] = IO.timer(ec)
       val contextRuntimeBuilder = new ContextRuntimeBuilder[IO] {
         override def make[T](empty: T): IO[ContextRuntime[IO, T]] = {
           Ref.of(empty).map { context =>
@@ -101,7 +101,7 @@ object ConsoleLoggerTest {
   )(implicit
       val F: ConcurrentEffect[F],
       val C: MockClock[F],
-      val T: Timer[F]
+      val T: Temporal[F]
   ) {
     val loggerName = "test-logger"
     val logger = loggerFactory.make(loggerName)
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 9389a93..8009c0b 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -2,7 +2,7 @@ import sbt._
 
 object Dependencies {
   lazy val catsCore = "org.typelevel" %% "cats-core" % "2.10.0"
-  lazy val catsEffect = "org.typelevel" %% "cats-effect" % "2.5.5"
+  lazy val catsEffect = "org.typelevel" %% "cats-effect" % "3.5.3"
   lazy val catsMtl = "org.typelevel" %% "cats-mtl-core" % "0.7.1"
   lazy val circeCore = "io.circe" %% "circe-core" % "0.14.6"
   lazy val circeLiteral =
diff --git a/shared/src/test/scala/slog4s/shared/ContextTest.scala b/shared/src/test/scala/slog4s/shared/ContextTest.scala
index 405dc31..3c19388 100644
--- a/shared/src/test/scala/slog4s/shared/ContextTest.scala
+++ b/shared/src/test/scala/slog4s/shared/ContextTest.scala
@@ -1,19 +1,19 @@
 package slog4s.shared
 
-import cats.effect.concurrent.Deferred
 import cats.effect.syntax.all._
-import cats.effect.{Bracket, ConcurrentEffect, Timer}
+import cats.effect.ConcurrentEffect
 import cats.syntax.flatMap._
 import cats.syntax.functor._
 import slog4s.EffectTest
 import slog4s.shared.ContextTest.Fixture
+import cats.effect.{ Deferred, MonadCancel, Temporal }
 
 abstract class ContextTest[F[_]](runtimeName: String) extends EffectTest[F] {
   override type FixtureParam = Fixture[F]
   override protected def asEffect(
       fixtureParam: Fixture[F]
   ): ConcurrentEffect[F] = fixtureParam.F
-  override protected def asTimer(fixtureParam: Fixture[F]): Timer[F] =
+  override protected def asTimer(fixtureParam: Fixture[F]): Temporal[F] =
     fixtureParam.T
 
   describe(s"$runtimeName-based context") {
@@ -95,8 +95,8 @@ abstract class ContextTest[F[_]](runtimeName: String) extends EffectTest[F] {
           promise <- Deferred[F, Unit]
           // promise used to indicate that a fiber has entered inside `guarantee`.
           fiberStarted <- Deferred[F, Unit]
-          fiber <- Bracket[F, Throwable]
-            .guarantee(fiberCode(fiberStarted))(promise.complete(()))
+          fiber <- MonadCancel[F, Throwable]
+            .guarantee(fiberCode(fiberStarted), promise.complete(()))
             .start
           _ <- fiberStarted.get
           _ <- fiber.cancel.start
@@ -110,7 +110,7 @@ abstract class ContextTest[F[_]](runtimeName: String) extends EffectTest[F] {
 object ContextTest {
   final class Fixture[F[_]](implicit
       val F: ConcurrentEffect[F],
-      val T: Timer[F],
+      val T: Temporal[F],
       val asContext: AsContext[F, Int],
       val useContext: UseContext[F, Int]
   )