diff --git a/project/Build.scala b/project/Build.scala
index 7560997da109..b4ae52e1b513 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -85,7 +85,7 @@ object Build {
 
   val referenceVersion = "3.3.1-RC4"
 
-  val baseVersion = "3.3.2-RC1" // temporarily, before branching out `3.4.0-RC1`
+  val baseVersion = "3.4.0-RC1"
 
   // Versions used by the vscode extension to create a new project
   // This should be the latest published releases.
diff --git a/project/MiMaFilters.scala b/project/MiMaFilters.scala
index e68455c1bafc..b40e53cb4f39 100644
--- a/project/MiMaFilters.scala
+++ b/project/MiMaFilters.scala
@@ -3,20 +3,6 @@ import com.typesafe.tools.mima.core._
 
 object MiMaFilters {
   val Library: Seq[ProblemFilter] = Seq(
-    ProblemFilters.exclude[MissingClassProblem]("scala.annotation.unchecked.uncheckedCaptures"),
-
-    // Scala.js only: new runtime support class in 3.2.3; not available to users
-    ProblemFilters.exclude[MissingClassProblem]("scala.scalajs.runtime.AnonFunctionXXL"),
-
-    //  New experimental features in 3.3.X
-    ProblemFilters.exclude[MissingFieldProblem]("scala.runtime.stdLibPatches.language#experimental.clauseInterleaving"),
-    ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$experimental$clauseInterleaving$"),
-    ProblemFilters.exclude[MissingFieldProblem]("scala.runtime.stdLibPatches.language#experimental.relaxedExtensionImports"),
-    ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$experimental$relaxedExtensionImports$"),
-    ProblemFilters.exclude[DirectMissingMethodProblem]("scala.runtime.Tuples.reverse"),
-    ProblemFilters.exclude[MissingFieldProblem]("scala.Tuple.Helpers"),
-    ProblemFilters.exclude[MissingClassProblem]("scala.annotation.internal.CaptureChecked"),
-    // end of New experimental features in 3.3.X
   )
   val TastyCore: Seq[ProblemFilter] = Seq(
   )