diff --git a/gradle-plugins/build.gradle.kts b/gradle-plugins/build.gradle.kts
index fc57515fbb..5c6c19a219 100644
--- a/gradle-plugins/build.gradle.kts
+++ b/gradle-plugins/build.gradle.kts
@@ -34,8 +34,10 @@ subprojects {
             compilerOptions {
                 // must be set to a language version of the kotlin compiler & runtime,
                 // which is bundled to the oldest supported Gradle
-                languageVersion.set(KotlinVersion.KOTLIN_1_5)
-                apiVersion.set(KotlinVersion.KOTLIN_1_5)
+                // Current oldest-supported Gradle is 8.0,
+                // follow the https://docs.gradle.org/current/userguide/compatibility.html#kotlin
+                languageVersion.set(KotlinVersion.KOTLIN_1_8)
+                apiVersion.set(KotlinVersion.KOTLIN_1_8)
                 jvmTarget.set(JvmTarget.JVM_11)
             }
         }