diff --git a/project/Build.scala b/project/Build.scala
index e3b4ed789a1f..a5569c0d8888 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -83,7 +83,7 @@ object DottyJSPlugin extends AutoPlugin {
 object Build {
   import ScaladocConfigs._
 
-  val referenceVersion = "3.4.0"
+  val referenceVersion = "3.4.1"
 
   val baseVersion = "3.4.2-RC1"
 
@@ -104,7 +104,7 @@ 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"
+  val previousDottyVersion = "3.4.1"
 
   /** Version against which we check binary compatibility. */
   val ltsDottyVersion = "3.3.0"
diff --git a/tasty/src/dotty/tools/tasty/TastyFormat.scala b/tasty/src/dotty/tools/tasty/TastyFormat.scala
index e17c98234691..b5ca6f45f594 100644
--- a/tasty/src/dotty/tools/tasty/TastyFormat.scala
+++ b/tasty/src/dotty/tools/tasty/TastyFormat.scala
@@ -318,7 +318,7 @@ object TastyFormat {
    *  compatibility, but remains backwards compatible, with all
    *  preceding `MinorVersion`.
    */
-  final val MinorVersion: Int = 5
+  final val MinorVersion: Int = 4
 
   /** Natural Number. The `ExperimentalVersion` allows for
    *  experimentation with changes to TASTy without committing
@@ -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.
    *