diff --git a/library/src/scala/runtime/ErasedFunction.scala b/library/src/scala/runtime/ErasedFunction.scala
deleted file mode 100644
index dbbcc3431cc9..000000000000
--- a/library/src/scala/runtime/ErasedFunction.scala
+++ /dev/null
@@ -1,13 +0,0 @@
-package scala.runtime
-
-import scala.annotation.experimental
-
-/** Marker trait for function types with erased parameters.
- *
- *  This trait will be refined with an `apply` method with erased parameters:
- *      ErasedFunction { def apply([erased] x_1: P_1, ..., [erased] x_N: P_N): R }
- *  This type will be erased to FunctionL, where L = N - count(erased).
- *
- *  Note: Now we use `scala.PolyFunction` instead. This will be removed.
- */
-@experimental trait ErasedFunction // TODO delete. Cannot be deleted until the reference compiler stops using it.
diff --git a/project/Build.scala b/project/Build.scala
index a849e37c41fd..ace0588e9ab3 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -83,7 +83,7 @@ object DottyJSPlugin extends AutoPlugin {
 object Build {
   import ScaladocConfigs._
 
-  val referenceVersion = "3.3.1"
+  val referenceVersion = "3.4.0"
 
   val baseVersion = "3.4.2-RC1"
 
@@ -101,7 +101,7 @@ object Build {
    *  set to 3.1.3. If it is going to be 3.1.0, it must be set to the latest
    *  3.0.x release.
    */
-  val previousDottyVersion = "3.4.0-RC3"
+  val previousDottyVersion = "3.4.0"
 
   /** Version against which we check binary compatibility. */
   val ltsDottyVersion = "3.3.0"
diff --git a/tests/run-tasty-inspector/stdlibExperimentalDefinitions.scala b/tests/run-tasty-inspector/stdlibExperimentalDefinitions.scala
index 111c8c0bada3..888e5c36405d 100644
--- a/tests/run-tasty-inspector/stdlibExperimentalDefinitions.scala
+++ b/tests/run-tasty-inspector/stdlibExperimentalDefinitions.scala
@@ -86,7 +86,6 @@ val experimentalDefinitionInLibrary = Set(
 
   // New feature: functions with erased parameters.
   // Need erasedDefinitions enabled.
-  "scala.runtime.ErasedFunction", // will be removed (now using PolyFunction)
   "scala.quoted.Quotes.reflectModule.MethodTypeMethods.erasedParams",
   "scala.quoted.Quotes.reflectModule.MethodTypeMethods.hasErasedParams",
   "scala.quoted.Quotes.reflectModule.TermParamClauseMethods.erasedArgs",