diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 965fc7e2..579a4373 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         java: ['adopt@1.8', 'adopt@1.11']
-        scala: ['2.11.12', '2.12.11', '2.13.3', '0.27.0-RC1']
+        scala: ['2.11.12', '2.12.13', '2.13.4', '3.0.0-M3']
     steps:
     - uses: actions/checkout@v2.3.4
     - uses: olafurpg/setup-scala@v10
diff --git a/nio-core/src/test/scala/zio/nio/core/channels/ChannelSpec.scala b/nio-core/src/test/scala/zio/nio/core/channels/ChannelSpec.scala
index ce5cf42b..2f37951a 100644
--- a/nio-core/src/test/scala/zio/nio/core/channels/ChannelSpec.scala
+++ b/nio-core/src/test/scala/zio/nio/core/channels/ChannelSpec.scala
@@ -3,7 +3,6 @@ package zio.nio.core.channels
 import java.io.{ EOFException, FileNotFoundException, IOException }
 
 import zio.nio.core.{ BaseSpec, Buffer, EffectOps, SocketAddress }
-import zio.test.{ suite, testM }
 import zio.{ IO, _ }
 import zio.test._
 import zio.test.Assertion._
diff --git a/nio-core/src/test/scala/zio/nio/core/channels/DatagramChannelSpec.scala b/nio-core/src/test/scala/zio/nio/core/channels/DatagramChannelSpec.scala
index f6ccdac5..973742c3 100644
--- a/nio-core/src/test/scala/zio/nio/core/channels/DatagramChannelSpec.scala
+++ b/nio-core/src/test/scala/zio/nio/core/channels/DatagramChannelSpec.scala
@@ -4,7 +4,7 @@ import java.io.IOException
 
 import zio.nio.core._
 import zio.test.Assertion._
-import zio.test.{ suite, testM, _ }
+import zio.test._
 import zio.{ IO, _ }
 
 object DatagramChannelSpec extends BaseSpec {
diff --git a/nio/src/test/scala/zio/nio/channels/ChannelSpec.scala b/nio/src/test/scala/zio/nio/channels/ChannelSpec.scala
index 2c04a3c8..0653b543 100644
--- a/nio/src/test/scala/zio/nio/channels/ChannelSpec.scala
+++ b/nio/src/test/scala/zio/nio/channels/ChannelSpec.scala
@@ -2,7 +2,6 @@ package zio.nio.channels
 
 import zio.nio.BaseSpec
 import zio.nio.core.{ Buffer, SocketAddress }
-import zio.test.{ suite, testM }
 import zio.{ IO, _ }
 import zio.test._
 import zio.test.Assertion._
diff --git a/nio/src/test/scala/zio/nio/channels/DatagramChannelSpec.scala b/nio/src/test/scala/zio/nio/channels/DatagramChannelSpec.scala
index dcd46a5b..cfab45b9 100644
--- a/nio/src/test/scala/zio/nio/channels/DatagramChannelSpec.scala
+++ b/nio/src/test/scala/zio/nio/channels/DatagramChannelSpec.scala
@@ -3,7 +3,7 @@ package zio.nio.channels
 import zio.nio._
 import zio.nio.core.{ Buffer, SocketAddress }
 import zio.test.Assertion._
-import zio.test.{ suite, testM, _ }
+import zio.test._
 import zio._
 
 object DatagramChannelSpec extends BaseSpec {
diff --git a/project/BuildHelper.scala b/project/BuildHelper.scala
index 9b2535fb..1d62eab5 100644
--- a/project/BuildHelper.scala
+++ b/project/BuildHelper.scala
@@ -51,7 +51,7 @@ object BuildHelper {
     }
   )
 
-  val ZioCoreVersion = "1.0.3"
+  val ZioCoreVersion = "1.0.4-2"
 
   private val Scala211     = "2.11.12"
   private val Scala212     = "2.12.12"
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 57a68431..07717a48 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -3,5 +3,5 @@ addSbtPlugin("ch.epfl.scala"                     % "sbt-bloop"        % "1.4.6")
 addSbtPlugin("com.geirsson"                      % "sbt-ci-release"   % "1.5.5")
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.0")
 addSbtPlugin("io.github.davidgregory084"         % "sbt-tpolecat"     % "0.1.16")
-addSbtPlugin("org.scalameta"                     % "sbt-mdoc"         % "2.2.10")
+addSbtPlugin("org.scalameta"                     % "sbt-mdoc"         % "2.2.17")
 addSbtPlugin("org.scalameta"                     % "sbt-scalafmt"     % "2.4.2")