diff --git a/project/Build.scala b/project/Build.scala
index 79570fdbd401..1640bf0fac1b 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -83,9 +83,9 @@ object DottyJSPlugin extends AutoPlugin {
 object Build {
   import ScaladocConfigs._
 
-  val referenceVersion = "3.4.0-RC3"
+  val referenceVersion = "3.3.1"
 
-  val baseVersion = "3.4.0-RC4"
+  val baseVersion = "3.4.0"
 
   // Versions used by the vscode extension to create a new project
   // This should be the latest published releases.
diff --git a/tasty/src/dotty/tools/tasty/TastyFormat.scala b/tasty/src/dotty/tools/tasty/TastyFormat.scala
index ce3e1a852c74..aa14904b6889 100644
--- a/tasty/src/dotty/tools/tasty/TastyFormat.scala
+++ b/tasty/src/dotty/tools/tasty/TastyFormat.scala
@@ -334,7 +334,7 @@ object TastyFormat {
    *  is able to read final TASTy documents if the file's
    *  `MinorVersion` is strictly less than the current value.
    */
-  final val ExperimentalVersion: Int = 1
+  final val ExperimentalVersion: Int = 0
 
   /**This method implements a binary relation (`<:<`) between two TASTy versions.
    *