diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/IncrementalCompilationMultiProjectIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/IncrementalCompilationMultiProjectIT.kt
index 82ea5f77d9e..4ec8dae6ae8 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/IncrementalCompilationMultiProjectIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/IncrementalCompilationMultiProjectIT.kt
@@ -151,10 +151,22 @@ open class IncrementalCompilationJsMultiProjectIT : BaseIncrementalCompilationMu
     }
 }
 
-class IncrementalCompilationJsMultiProjectWithPreciseBackupIT : IncrementalCompilationJsMultiProjectIT() {
+open class IncrementalCompilationJsMultiProjectWithPreciseBackupIT : IncrementalCompilationJsMultiProjectIT() {
     override val defaultBuildOptions = super.defaultBuildOptions.copy(usePreciseOutputsBackup = true, keepIncrementalCompilationCachesInMemory = true)
 }
 
+class IncrementalCompilationFirJsMultiProject : IncrementalCompilationJsMultiProjectIT() {
+    override val defaultBuildOptions = super.defaultBuildOptions.copy(
+        languageVersion = "2.0"
+    )
+}
+
+class IncrementalCompilationFirJsMultiProjectWithPreciseBackupIT : IncrementalCompilationJsMultiProjectWithPreciseBackupIT() {
+    override val defaultBuildOptions = super.defaultBuildOptions.copy(
+        languageVersion = "2.0"
+    )
+}
+
 @JvmGradlePluginTests
 open class IncrementalCompilationJvmMultiProjectIT : BaseIncrementalCompilationMultiProjectIT() {
     override val additionalLibDependencies: String =