diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index a0d3358a83..a66ac9af18 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -11,7 +11,6 @@ object Dependencies {
   import DependencyHelpers._
 
   lazy val scalaTestVersion = settingKey[String]("The version of ScalaTest to use.")
-  lazy val scalaTestPlusVersion = settingKey[String]("The version of ScalaTestPlus to use.")
   lazy val scalaCheckVersion = settingKey[String]("The version of ScalaCheck to use.")
   lazy val java8CompatVersion = settingKey[String]("The version of scala-java8-compat to use.")
 
@@ -39,7 +38,6 @@ object Dependencies {
     scalaVersion := System.getProperty("akka.build.scalaVersion", crossScalaVersions.value.head),
     scalaCheckVersion := sys.props.get("akka.build.scalaCheckVersion").getOrElse("1.14.3"),
     scalaTestVersion := "3.1.0",
-    scalaTestPlusVersion := "3.1.0.0",
     java8CompatVersion := {
       CrossVersion.partialVersion(scalaVersion.value) match {
         // java8-compat is only used in a couple of places for 2.13,
@@ -112,12 +110,10 @@ object Dependencies {
       val mockito = "org.mockito" % "mockito-core" % "3.2.4" % "test" // MIT
       // changing the scalatest dependency must be reflected in akka-docs/rst/dev/multi-jvm-testing.rst
       val scalatest = Def.setting { "org.scalatest" %% "scalatest" % scalaTestVersion.value % "test" } // ApacheV2
-      val scalatestJUnit = Def.setting { "org.scalatestplus" %% "junit-4-12" % scalaTestPlusVersion.value % "test" } // ApacheV2
-      val scalatestTestNG = Def.setting { "org.scalatestplus" %% "testng-6-7" % scalaTestPlusVersion.value % "test" } // ApacheV2
-      val scalatestScalaCheck = Def.setting {
-        "org.scalatestplus" %% "scalacheck-1-14" % scalaTestPlusVersion.value % "test"
-      } // ApacheV2
-      val scalatestMockito = Def.setting { "org.scalatestplus" %% "mockito-1-10" % scalaTestPlusVersion.value % "test" } // ApacheV2
+      val scalatestJUnit = "org.scalatestplus" %% "junit-4-12" % "3.1.0.0" % "test" // ApacheV2
+      val scalatestTestNG = "org.scalatestplus" %% "testng-6-7" % "3.1.0.0" % "test" // ApacheV2
+      val scalatestScalaCheck = "org.scalatestplus" %% "scalacheck-1-14" % "3.1.0.1" % "test" // ApacheV2
+      val scalatestMockito = "org.scalatestplus" %% "mockito-1-10" % "3.1.0.0" % "test" // ApacheV2
       val scalacheck = Def.setting { "org.scalacheck" %% "scalacheck" % scalaCheckVersion.value % "test" } // New BSD
       val pojosr = "com.googlecode.pojosr" % "de.kalpatec.pojosr.framework" % "0.2.1" % "test" // ApacheV2
       val tinybundles = "org.ops4j.pax.tinybundles" % "tinybundles" % "3.0.0" % "test" // ApacheV2
@@ -183,8 +179,8 @@ object Dependencies {
   val actorTests = l ++= Seq(
         Test.junit,
         Test.scalatest.value,
-        Test.scalatestJUnit.value,
-        Test.scalatestScalaCheck.value,
+        Test.scalatestJUnit,
+        Test.scalatestScalaCheck,
         Test.commonsCodec,
         Test.commonsMath,
         Test.scalacheck.value,
@@ -197,7 +193,7 @@ object Dependencies {
         Provided.logback,
         Provided.junit,
         Provided.scalatest.value,
-        Test.scalatestJUnit.value)
+        Test.scalatestJUnit)
 
   val remoteDependencies = Seq(netty, aeronDriver, aeronClient)
   val remoteOptionalDependencies = remoteDependencies.map(_ % "optional")
@@ -225,7 +221,7 @@ object Dependencies {
         Test.slf4jLog4j,
         Test.logback,
         Test.mockito,
-        Test.scalatestMockito.value)
+        Test.scalatestMockito)
 
   val distributedData = l ++= Seq(lmdb, Test.junit, Test.scalatest.value)
 
@@ -235,7 +231,7 @@ object Dependencies {
         Provided.levelDB,
         Provided.levelDBNative,
         Test.scalatest.value,
-        Test.scalatestJUnit.value,
+        Test.scalatestJUnit,
         Test.junit,
         Test.commonsIo,
         Test.commonsCodec)
@@ -290,14 +286,14 @@ object Dependencies {
   lazy val streamTests = l ++= Seq(
         Test.scalatest.value,
         Test.scalacheck.value,
-        Test.scalatestScalaCheck.value,
+        Test.scalatestScalaCheck,
         Test.junit,
         Test.commonsIo,
         Test.jimfs)
 
   lazy val streamTestsTck = l ++= Seq(
         Test.scalatest.value,
-        Test.scalatestTestNG.value,
+        Test.scalatestTestNG,
         Test.scalacheck.value,
         Test.junit,
         Test.reactiveStreamsTck)