diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kapt3IT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kapt3IT.kt
index 92b5be4031a..cdeadde92fd 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kapt3IT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kapt3IT.kt
@@ -36,7 +36,7 @@ import kotlin.io.path.deleteExisting
 import kotlin.io.path.outputStream
 import kotlin.test.assertEquals
 
-abstract class Kapt3BaseIT : KGPBaseTest() {
+abstract class Kapt3BaseIT(val languageVersion: String = "1.9") : KGPBaseTest() {
     companion object {
         private const val KAPT_SUCCESSFUL_MESSAGE = "Annotation processing complete, errors: 0"
     }
@@ -44,6 +44,7 @@ abstract class Kapt3BaseIT : KGPBaseTest() {
     override val defaultBuildOptions: BuildOptions = super.defaultBuildOptions
         .copy(
             kaptOptions = this.kaptOptions(),
+            languageVersion = languageVersion,
         )
 
     protected open fun kaptOptions(): BuildOptions.KaptOptions = BuildOptions.KaptOptions(
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinJavaToolchainTest.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinJavaToolchainTest.kt
index 2cfad9f5710..9565b7e0595 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinJavaToolchainTest.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinJavaToolchainTest.kt
@@ -181,6 +181,7 @@ class KotlinJavaToolchainTest : KGPBaseTest() {
         project(
             projectName = "simpleWithKapt".fullProjectName,
             gradleVersion = gradleVersion,
+            buildOptions = defaultBuildOptions.copy(languageVersion = "1.9"),
         ) {
             if (shouldUseToolchain(gradleVersion)) {
                 useToolchainExtension(11)
@@ -216,6 +217,7 @@ class KotlinJavaToolchainTest : KGPBaseTest() {
         project(
             projectName = "simpleWithKapt".fullProjectName,
             gradleVersion = gradleVersion,
+            buildOptions = defaultBuildOptions.copy(languageVersion = "1.9"),
         ) {
             build("assemble") {
                 assertOutputContains("Using workers NONE isolation mode to run kapt")
@@ -233,7 +235,7 @@ class KotlinJavaToolchainTest : KGPBaseTest() {
             projectName = "simpleWithKapt".fullProjectName,
             gradleVersion = gradleVersion,
             projectPathAdditionalSuffix = "1/cache-test",
-            buildOptions = defaultBuildOptions.copy(buildCacheEnabled = true)
+            buildOptions = defaultBuildOptions.copy(buildCacheEnabled = true, languageVersion = "1.9")
         ) {
             enableLocalBuildCache(buildCache)
             if (shouldUseToolchain(gradleVersion)) {
@@ -252,7 +254,7 @@ class KotlinJavaToolchainTest : KGPBaseTest() {
             projectName = "simpleWithKapt".fullProjectName,
             gradleVersion = gradleVersion,
             projectPathAdditionalSuffix = "2/cache-test",
-            buildOptions = defaultBuildOptions.copy(buildCacheEnabled = true),
+            buildOptions = defaultBuildOptions.copy(buildCacheEnabled = true, languageVersion = "1.9"),
         ) {
             enableLocalBuildCache(buildCache)
             if (shouldUseToolchain(gradleVersion)) {
@@ -283,7 +285,7 @@ class KotlinJavaToolchainTest : KGPBaseTest() {
             projectName = "simpleWithKapt".fullProjectName,
             gradleVersion = gradleVersion,
             projectPathAdditionalSuffix = "1/cache-test",
-            buildOptions = defaultBuildOptions.copy(buildCacheEnabled = true)
+            buildOptions = defaultBuildOptions.copy(buildCacheEnabled = true, languageVersion = "1.9")
         ) {
             enableLocalBuildCache(buildCache)
 
@@ -294,7 +296,7 @@ class KotlinJavaToolchainTest : KGPBaseTest() {
             projectName = "simpleWithKapt".fullProjectName,
             gradleVersion = gradleVersion,
             projectPathAdditionalSuffix = "2/cache-test",
-            buildOptions = defaultBuildOptions.copy(buildCacheEnabled = true),
+            buildOptions = defaultBuildOptions.copy(buildCacheEnabled = true, languageVersion = "1.9"),
         ) {
             enableLocalBuildCache(buildCache)
             gradleProperties.append(