diff --git a/build.gradle b/build.gradle
index 83b0597..8cfd451 100644
--- a/build.gradle
+++ b/build.gradle
@@ -38,17 +38,14 @@ processResources {
 }
 
 tasks.withType(JavaCompile).configureEach {
-	it.options.release = 21
+	it.options.release = 17
 }
 
 java {
-	// Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
-	// if it is present.
-	// 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 {
diff --git a/src/main/resources/leavesly.mixins.json b/src/main/resources/leavesly.mixins.json
index 36df2ba..681e3dd 100644
--- a/src/main/resources/leavesly.mixins.json
+++ b/src/main/resources/leavesly.mixins.json
@@ -1,7 +1,7 @@
 {
 	"required": true,
 	"package": "com.ishikyoo.leavesly.mixin",
-	"compatibilityLevel": "JAVA_21",
+	"compatibilityLevel": "JAVA_17",
 	"mixins": [
 		"LeavesBlockMixin",
 		"CherryLeavesBlockMixin",