diff --git a/build.gradle.kts b/build.gradle.kts
index 57e8e522729..af388fc6bce 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -708,24 +708,24 @@ tasks {
         dependsOn(":kotlin-scripting-dependencies:test")
         dependsOn(":kotlin-scripting-dependencies-maven:test")
         dependsOn(":kotlin-scripting-dependencies-maven-all:test")
-        dependsOn(":kotlin-scripting-jsr223-test:test")
         // see comments on the task in kotlin-scripting-jvm-host-test
 //        dependsOn(":kotlin-scripting-jvm-host-test:embeddableTest")
-        dependsOn(":kotlin-scripting-jsr223-test:embeddableTest")
-        dependsOn(":kotlin-scripting-ide-services-test:test")
-        dependsOn(":kotlin-scripting-ide-services-test:embeddableTest")
         dependsOn(":kotlin-main-kts-test:test")
     }
 
-    register("scriptingK2Test") {
-        dependsOn(":kotlin-scripting-compiler:testWithK2")
-        dependsOn(":kotlin-scripting-jvm-host-test:testWithK2")
-        dependsOn(":kotlin-main-kts-test:testWithK2")
+    register("scriptingK1JvmTest") {
+        dependsOn(":kotlin-scripting-compiler:testWithK1")
+        dependsOn(":kotlin-scripting-jvm-host-test:testWithK1")
+        dependsOn(":kotlin-main-kts-test:testWithK1")
+        dependsOn(":kotlin-scripting-jsr223-test:test")
+        dependsOn(":kotlin-scripting-jsr223-test:embeddableTest")
+        dependsOn(":kotlin-scripting-ide-services-test:test")
+        dependsOn(":kotlin-scripting-ide-services-test:embeddableTest")
     }
 
     register("scriptingTest") {
         dependsOn("scriptingJvmTest")
-        dependsOn("scriptingK2Test")
+        dependsOn("scriptingK1JvmTest")
     }
 
     register("compilerTest") {
diff --git a/libraries/scripting/jsr223-test/build.gradle.kts b/libraries/scripting/jsr223-test/build.gradle.kts
index 4a5f6b847e4..1d8ddfa85f9 100644
--- a/libraries/scripting/jsr223-test/build.gradle.kts
+++ b/libraries/scripting/jsr223-test/build.gradle.kts
@@ -53,6 +53,7 @@ projectTest(parallel = true) {
     doFirst {
         systemProperty("testJsr223RuntimeClasspath", testRuntimeProvider.get())
         systemProperty("testCompilationClasspath", testCompilationClasspathProvider.get())
+        systemProperty("kotlin.script.base.compiler.arguments", "-language-version 1.9")
     }
 }
 
@@ -60,4 +61,11 @@ projectTest(taskName = "embeddableTest", parallel = true) {
     workingDir = rootDir
     dependsOn(embeddableTestRuntime)
     classpath = embeddableTestRuntime
+    val testRuntimeProvider = project.provider { embeddableTestRuntime.asPath }
+    val testCompilationClasspathProvider = project.provider { testCompilationClasspath.asPath }
+    doFirst {
+        systemProperty("testJsr223RuntimeClasspath", testRuntimeProvider.get())
+        systemProperty("testCompilationClasspath", testCompilationClasspathProvider.get())
+        systemProperty("kotlin.script.base.compiler.arguments", "-language-version 1.9")
+    }
 }
diff --git a/libraries/scripting/jvm-host-test/build.gradle.kts b/libraries/scripting/jvm-host-test/build.gradle.kts
index 7bea1e2c7e3..c4212c18841 100644
--- a/libraries/scripting/jvm-host-test/build.gradle.kts
+++ b/libraries/scripting/jvm-host-test/build.gradle.kts
@@ -53,8 +53,10 @@ projectTest(parallel = true) {
 //    classpath = embeddableTestRuntime
 //}
 
-projectTest(taskName = "testWithK2", parallel = true) {
+projectTest(taskName = "testWithK1", parallel = true) {
     dependsOn(":dist")
     workingDir = rootDir
-    systemProperty("kotlin.script.base.compiler.arguments", "-language-version 2.0")
+    doFirst {
+        systemProperty("kotlin.script.base.compiler.arguments", "-language-version 1.9")
+    }
 }
diff --git a/libraries/tools/kotlin-main-kts-test/build.gradle.kts b/libraries/tools/kotlin-main-kts-test/build.gradle.kts
index 9c3aee4961f..d8d71a0d023 100644
--- a/libraries/tools/kotlin-main-kts-test/build.gradle.kts
+++ b/libraries/tools/kotlin-main-kts-test/build.gradle.kts
@@ -25,18 +25,20 @@ sourceSets {
 
 projectTest(parallel = true) {
     dependsOn(":dist", ":kotlinx-serialization-compiler-plugin.embeddable:embeddable")
+    workingDir = rootDir
     val localKotlinxSerializationPluginClasspath: FileCollection = kotlinxSerializationGradlePluginClasspath
     doFirst {
         systemProperty("kotlin.script.test.kotlinx.serialization.plugin.classpath", localKotlinxSerializationPluginClasspath.asPath)
     }
-    workingDir = rootDir
 }
 
-projectTest(taskName = "testWithK2", parallel = true) {
+projectTest(taskName = "testWithK1", parallel = true) {
     dependsOn(":dist", ":kotlinx-serialization-compiler-plugin.embeddable:embeddable")
     workingDir = rootDir
     val localKotlinxSerializationPluginClasspath: FileCollection = kotlinxSerializationGradlePluginClasspath
-    systemProperty("kotlin.script.test.kotlinx.serialization.plugin.classpath", localKotlinxSerializationPluginClasspath.asPath)
-    systemProperty("kotlin.script.base.compiler.arguments", "-language-version 2.0")
-    systemProperty("kotlin.script.test.base.compiler.arguments", "-language-version 2.0")
+    doFirst {
+        systemProperty("kotlin.script.test.kotlinx.serialization.plugin.classpath", localKotlinxSerializationPluginClasspath.asPath)
+        systemProperty("kotlin.script.base.compiler.arguments", "-language-version 1.9")
+        systemProperty("kotlin.script.test.base.compiler.arguments", "-language-version 1.9")
+    }
 }
diff --git a/plugins/scripting/scripting-compiler/build.gradle.kts b/plugins/scripting/scripting-compiler/build.gradle.kts
index 6399f16822d..7e55d337f6b 100644
--- a/plugins/scripting/scripting-compiler/build.gradle.kts
+++ b/plugins/scripting/scripting-compiler/build.gradle.kts
@@ -63,14 +63,18 @@ testsJar()
 projectTest(parallel = true) {
     dependsOn(":dist")
     workingDir = rootDir
-    systemProperty("kotlin.test.script.classpath", testSourceSet.output.classesDirs.joinToString(File.pathSeparator))
+    doFirst {
+        systemProperty("kotlin.test.script.classpath", testSourceSet.output.classesDirs.joinToString(File.pathSeparator))
+    }
 }
 
-projectTest(taskName = "testWithK2", parallel = true) {
+projectTest(taskName = "testWithK1", parallel = true) {
     dependsOn(":dist")
     workingDir = rootDir
-    systemProperty("kotlin.test.script.classpath", testSourceSet.output.classesDirs.joinToString(File.pathSeparator))
-    systemProperty("kotlin.script.test.base.compiler.arguments", "-language-version 2.0")
-    systemProperty("kotlin.script.base.compiler.arguments", "-language-version 2.0")
+    doFirst {
+        systemProperty("kotlin.test.script.classpath", testSourceSet.output.classesDirs.joinToString(File.pathSeparator))
+        systemProperty("kotlin.script.test.base.compiler.arguments", "-language-version 1.9")
+        systemProperty("kotlin.script.base.compiler.arguments", "-language-version 1.9")
+    }
 }
 
diff --git a/plugins/scripting/scripting-ide-services-test/build.gradle.kts b/plugins/scripting/scripting-ide-services-test/build.gradle.kts
index 5efb85d3aaa..77f3467064c 100644
--- a/plugins/scripting/scripting-ide-services-test/build.gradle.kts
+++ b/plugins/scripting/scripting-ide-services-test/build.gradle.kts
@@ -59,6 +59,9 @@ tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinCompile<*>> {
 projectTest(parallel = true) {
     dependsOn(":kotlin-compiler:distKotlinc")
     workingDir = rootDir
+    doFirst {
+        systemProperty("kotlin.script.base.compiler.arguments", "-language-version 1.9")
+    }
 }
 
 // This doesn;t work now due to conflicts between embeddable compiler contents and intellij sdk modules
@@ -69,4 +72,7 @@ projectTest(taskName = "embeddableTest", parallel = true) {
     classpath = embeddableTestRuntime
 
     exclude("**/JvmReplIdeTest.class")
+    doFirst {
+        systemProperty("kotlin.script.base.compiler.arguments", "-language-version 1.9")
+    }
 }