diff --git a/build.gradle b/build.gradle
index a026828..4dc1c03 100644
--- a/build.gradle
+++ b/build.gradle
@@ -32,7 +32,7 @@ allprojects {
 configure(subprojects) {
 	apply plugin: 'java-library'
 	apply plugin: 'kotlin'
-	sourceCompatibility = 19
+	sourceCompatibility = 17
 	compileJava {
 		options.incremental = true
 	}
diff --git a/lwjgl3/build.gradle b/lwjgl3/build.gradle
index 84109cc..ce3d652 100644
--- a/lwjgl3/build.gradle
+++ b/lwjgl3/build.gradle
@@ -20,7 +20,7 @@ else {
 sourceSets.main.resources.srcDirs += [ rootProject.file('assets').path ]
 mainClassName = 'com.last.commit.lwjgl3.Lwjgl3Launcher'
 eclipse.project.name = appName + '-lwjgl3'
-sourceCompatibility = 19
+sourceCompatibility = 17
 
 dependencies {
 	implementation "com.badlogicgames.gdx:gdx-backend-lwjgl3:$gdxVersion"