diff --git a/build.gradle b/build.gradle
index 4c83ad7..ef65712 100644
--- a/build.gradle
+++ b/build.gradle
@@ -38,7 +38,7 @@ processResources {
 }
 
 tasks.withType(JavaCompile).configureEach {
-	it.options.release = 21
+	it.options.release = 17
 }
 
 java {
@@ -47,8 +47,8 @@ java {
 	// If you remove this line, sources will not be generated.
 	withSourcesJar()
 
-	sourceCompatibility = JavaVersion.VERSION_21
-	targetCompatibility = JavaVersion.VERSION_21
+	sourceCompatibility = JavaVersion.VERSION_17
+	targetCompatibility = JavaVersion.VERSION_17
 }
 
 jar {