diff --git a/libraries/kotlinx-metadata/jvm/ChangeLog.md b/libraries/kotlinx-metadata/jvm/ChangeLog.md
index afb1350244c..52f17bfc5c8 100644
--- a/libraries/kotlinx-metadata/jvm/ChangeLog.md
+++ b/libraries/kotlinx-metadata/jvm/ChangeLog.md
@@ -2,6 +2,7 @@
 
 ## 0.1.1
 
+- Breaking change: `KotlinClassMetadata.*.Writer.write` no longer accept `bytecodeVersion`.
 - [`KT-42429`](https://youtrack.jetbrains.com/issue/KT-42429) Wrong interpretation of Flag.Constructor.IS_PRIMARY
     - Breaking change: `Flag.Constructor.IS_PRIMARY` is deprecated, use `Flag.Constructor.IS_SECONDARY` instead
 - [`KT-37421`](https://youtrack.jetbrains.com/issue/KT-37421) Add Flag.Class.IS_FUN for functional interfaces
diff --git a/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/KotlinClassMetadata.kt b/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/KotlinClassMetadata.kt
index 881dfed1632..9ad54554626 100644
--- a/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/KotlinClassMetadata.kt
+++ b/libraries/kotlinx-metadata/jvm/src/kotlinx/metadata/jvm/KotlinClassMetadata.kt
@@ -58,20 +58,18 @@ sealed class KotlinClassMetadata(val header: KotlinClassHeader) {
              *
              * @param metadataVersion metadata version to be written to the metadata (see [KotlinClassHeader.metadataVersion]),
              *   [KotlinClassHeader.COMPATIBLE_METADATA_VERSION] by default
-             * @param bytecodeVersion bytecode version to be written to the metadata (see [KotlinClassHeader.bytecodeVersion]),
-             *   [KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION] by default
              * @param extraInt the value of the class-level flags to be written to the metadata (see [KotlinClassHeader.extraInt]),
              *   0 by default
              */
             @JvmOverloads
             fun write(
                 metadataVersion: IntArray = KotlinClassHeader.COMPATIBLE_METADATA_VERSION,
-                bytecodeVersion: IntArray = KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
                 extraInt: Int = 0
             ): Class {
                 val (d1, d2) = writeProtoBufData(t.build(), c)
                 val metadata = KotlinClassHeader(
-                    KotlinClassHeader.CLASS_KIND, metadataVersion, bytecodeVersion, d1, d2, null, null, extraInt
+                    KotlinClassHeader.CLASS_KIND, metadataVersion, KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
+                    d1, d2, null, null, extraInt
                 )
                 return Class(metadata)
             }
@@ -113,20 +111,18 @@ sealed class KotlinClassMetadata(val header: KotlinClassHeader) {
              *
              * @param metadataVersion metadata version to be written to the metadata (see [KotlinClassHeader.metadataVersion]),
              *   [KotlinClassHeader.COMPATIBLE_METADATA_VERSION] by default
-             * @param bytecodeVersion bytecode version to be written to the metadata (see [KotlinClassHeader.bytecodeVersion]),
-             *   [KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION] by default
              * @param extraInt the value of the class-level flags to be written to the metadata (see [KotlinClassHeader.extraInt]),
              *   0 by default
              */
             @JvmOverloads
             fun write(
                 metadataVersion: IntArray = KotlinClassHeader.COMPATIBLE_METADATA_VERSION,
-                bytecodeVersion: IntArray = KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
                 extraInt: Int = 0
             ): FileFacade {
                 val (d1, d2) = writeProtoBufData(t.build(), c)
                 val metadata = KotlinClassHeader(
-                    KotlinClassHeader.FILE_FACADE_KIND, metadataVersion, bytecodeVersion, d1, d2, null, null, extraInt
+                    KotlinClassHeader.FILE_FACADE_KIND, metadataVersion, KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
+                    d1, d2, null, null, extraInt
                 )
                 return FileFacade(metadata)
             }
@@ -186,15 +182,12 @@ sealed class KotlinClassMetadata(val header: KotlinClassHeader) {
              *
              * @param metadataVersion metadata version to be written to the metadata (see [KotlinClassHeader.metadataVersion]),
              *   [KotlinClassHeader.COMPATIBLE_METADATA_VERSION] by default
-             * @param bytecodeVersion bytecode version to be written to the metadata (see [KotlinClassHeader.bytecodeVersion]),
-             *   [KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION] by default
              * @param extraInt the value of the class-level flags to be written to the metadata (see [KotlinClassHeader.extraInt]),
              *   0 by default
              */
             @JvmOverloads
             fun write(
                 metadataVersion: IntArray = KotlinClassHeader.COMPATIBLE_METADATA_VERSION,
-                bytecodeVersion: IntArray = KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
                 extraInt: Int = 0
             ): SyntheticClass {
                 val proto = t?.build()
@@ -202,7 +195,8 @@ sealed class KotlinClassMetadata(val header: KotlinClassHeader) {
                     if (proto != null) writeProtoBufData(proto, c)
                     else Pair(emptyArray(), emptyArray())
                 val metadata = KotlinClassHeader(
-                    KotlinClassHeader.SYNTHETIC_CLASS_KIND, metadataVersion, bytecodeVersion, d1, d2, null, null, extraInt
+                    KotlinClassHeader.SYNTHETIC_CLASS_KIND, metadataVersion, KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
+                    d1, d2, null, null, extraInt
                 )
                 return SyntheticClass(metadata)
             }
@@ -230,8 +224,6 @@ sealed class KotlinClassMetadata(val header: KotlinClassHeader) {
              * @param partClassNames JVM internal names of the part classes which this multi-file class combines
              * @param metadataVersion metadata version to be written to the metadata (see [KotlinClassHeader.metadataVersion]),
              *   [KotlinClassHeader.COMPATIBLE_METADATA_VERSION] by default
-             * @param bytecodeVersion bytecode version to be written to the metadata (see [KotlinClassHeader.bytecodeVersion]),
-             *   [KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION] by default
              * @param extraInt the value of the class-level flags to be written to the metadata (see [KotlinClassHeader.extraInt]),
              *   0 by default
              */
@@ -239,12 +231,11 @@ sealed class KotlinClassMetadata(val header: KotlinClassHeader) {
             fun write(
                 partClassNames: List<String>,
                 metadataVersion: IntArray = KotlinClassHeader.COMPATIBLE_METADATA_VERSION,
-                bytecodeVersion: IntArray = KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
                 extraInt: Int = 0
             ): MultiFileClassFacade {
                 val metadata = KotlinClassHeader(
-                    KotlinClassHeader.MULTI_FILE_CLASS_FACADE_KIND, metadataVersion, bytecodeVersion, partClassNames.toTypedArray(),
-                    null, null, null, extraInt
+                    KotlinClassHeader.MULTI_FILE_CLASS_FACADE_KIND, metadataVersion, KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
+                    partClassNames.toTypedArray(), null, null, null, extraInt
                 )
                 return MultiFileClassFacade(metadata)
             }
@@ -296,8 +287,6 @@ sealed class KotlinClassMetadata(val header: KotlinClassHeader) {
              * @param facadeClassName JVM internal name of the corresponding multi-file class facade
              * @param metadataVersion metadata version to be written to the metadata (see [KotlinClassHeader.metadataVersion]),
              *   [KotlinClassHeader.COMPATIBLE_METADATA_VERSION] by default
-             * @param bytecodeVersion bytecode version to be written to the metadata (see [KotlinClassHeader.bytecodeVersion]),
-             *   [KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION] by default
              * @param extraInt the value of the class-level flags to be written to the metadata (see [KotlinClassHeader.extraInt]),
              *   0 by default
              */
@@ -305,12 +294,12 @@ sealed class KotlinClassMetadata(val header: KotlinClassHeader) {
             fun write(
                 facadeClassName: String,
                 metadataVersion: IntArray = KotlinClassHeader.COMPATIBLE_METADATA_VERSION,
-                bytecodeVersion: IntArray = KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
                 extraInt: Int = 0
             ): MultiFileClassPart {
                 val (d1, d2) = writeProtoBufData(t.build(), c)
                 val metadata = KotlinClassHeader(
-                    KotlinClassHeader.MULTI_FILE_CLASS_PART_KIND, metadataVersion, bytecodeVersion, d1, d2, facadeClassName, null, extraInt
+                    KotlinClassHeader.MULTI_FILE_CLASS_PART_KIND, metadataVersion, KotlinClassHeader.COMPATIBLE_BYTECODE_VERSION,
+                    d1, d2, facadeClassName, null, extraInt
                 )
                 return MultiFileClassPart(metadata)
             }