break config, but now works in 1.21.3

build.gradle

@@ -1,11 +1,8 @@
 plugins {
-	id 'fabric-loom' version '1.7-SNAPSHOT'
+	id 'fabric-loom' version '1.8-SNAPSHOT'
 	id 'maven-publish'
 }
 
-sourceCompatibility = JavaVersion.VERSION_17
-targetCompatibility = JavaVersion.VERSION_17
-
 archivesBaseName = project.archives_base_name
 version = project.mod_version
 group = project.maven_group
@@ -61,7 +58,7 @@ processResources {
 
 tasks.withType(JavaCompile).configureEach {
 	// Minecraft 1.18 (1.18-pre2) upwards uses Java 17.
-	it.options.release = 17
+	it.options.release = 21
 }
 
 java {
@@ -69,6 +66,8 @@ java {
 	// if it is present.
 	// If you remove this line, sources will not be generated.
 	withSourcesJar()
+	sourceCompatibility = JavaVersion.VERSION_21
+	targetCompatibility = JavaVersion.VERSION_21
 }
 
 jar {