diff --git a/README.md b/README.md
index 6ac8104c..366a66ec 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@
 ## 📥 Download
 You can find latest successful build in [GitHub Action](https://github.com/Winds-Studio/Leaf/actions) or [Releases](https://github.com/Winds-Studio/Leaf/releases)
 
-**Please note Java >= 21 is required.**
+**Please note Java >= 17 is required, Java >= 21 is recommended.**
 
 ## 📦 Building
 Building a Paperclip JAR for distribution:
diff --git a/build.gradle.kts b/build.gradle.kts
index 2ea6c2bb..91ef736c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -27,13 +27,13 @@ subprojects {
 
     java {
         toolchain {
-            languageVersion.set(JavaLanguageVersion.of(21))
+            languageVersion.set(JavaLanguageVersion.of(17))
         }
     }
 
     tasks.withType<JavaCompile> {
         options.encoding = Charsets.UTF_8.name()
-        options.release.set(21)
+        options.release.set(17)
     }
     tasks.withType<Javadoc> {
         options.encoding = Charsets.UTF_8.name()