diff --git a/src/main/java/net/neoforged/neoform/runtime/actions/RecompileSourcesActionWithJDK.java b/src/main/java/net/neoforged/neoform/runtime/actions/RecompileSourcesActionWithJDK.java
index fac1a92..71c7203 100644
--- a/src/main/java/net/neoforged/neoform/runtime/actions/RecompileSourcesActionWithJDK.java
+++ b/src/main/java/net/neoforged/neoform/runtime/actions/RecompileSourcesActionWithJDK.java
@@ -30,6 +30,8 @@ public void run(ProcessingEnvironment environment) throws IOException, Interrupt
         var classpath = getEffectiveClasspath(environment);
 
         var javaCompilerOptions = new ArrayList<String>();
+        javaCompilerOptions.add("--release");
+        javaCompilerOptions.add("21");
         javaCompilerOptions.add("-proc:none"); // No annotation processing on Minecraft sources
         javaCompilerOptions.add("-nowarn"); // We have no influence on Minecraft sources, so no warnings
         javaCompilerOptions.add("-g"); // Gradle compiles with debug by default, so we replicate this