diff --git a/.gitignore b/.gitignore
index ff3508cdb5..235cf03e66 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 /*/build
 app_pojavlauncher/src/main/assets/components/jre
 /app_pojavlauncher/src/main/assets/components/jre-new/
+/app_pojavlauncher/src/main/assets/components/jre-21/
 local.properties
 .idea/
 app_pojavlauncher/.cxx/
diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/NewJREUtil.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/NewJREUtil.java
index 1f264557b9..01bfa3db0b 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/NewJREUtil.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/NewJREUtil.java
@@ -101,7 +101,8 @@ private static void showRuntimeFail(Activity activity, JMinecraftVersionList.Ver
     }
 
     private enum InternalRuntime {
-        JRE_17(17, "Internal-17", "components/jre-new");
+        JRE_17(17, "Internal-17", "components/jre-new"),
+        JRE_21(21, "Internal-21", "components/jre-21");
         public final int majorVersion;
         public final String name;
         public final String path;