diff --git a/idea-plugin/gradle.properties b/idea-plugin/gradle.properties
index 4ce995b..dcaf71f 100644
--- a/idea-plugin/gradle.properties
+++ b/idea-plugin/gradle.properties
@@ -6,7 +6,7 @@ systemProp.file.encoding=UTF-8
 # \u63D2\u4EF6\u7248\u672C
 plugin_version=1.4
 # \u4F7F\u7528\u7684p3c-pmd\u7248\u672C
-p3c_pmd_version=2.1.1-ext-1
+p3c_pmd_version=2.1.1-ext-2
 publishUsername=Jack Chu
 publishToken=
 publishChannel=
diff --git a/p3c-pmd/build.gradle.kts b/p3c-pmd/build.gradle.kts
index 1ab9774..d667fbf 100644
--- a/p3c-pmd/build.gradle.kts
+++ b/p3c-pmd/build.gradle.kts
@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 /*
  * This file was generated by the Gradle 'init' task.
  */
@@ -28,6 +30,8 @@ description = "p3c-pmd"
 java {
     withJavadocJar()
     withSourcesJar()
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
 }
 
 publishing {
@@ -96,3 +100,10 @@ tasks.withType<Javadoc> {
     options.encoding = "UTF-8"
     (options as StandardJavadocDocletOptions).tags = listOf("date")
 }
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions {
+        freeCompilerArgs += "-Xjsr305=strict"
+        jvmTarget = "1.8"
+    }
+}
\ No newline at end of file