diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
index 57b999ec00..6604f99e1e 100644
--- a/.github/workflows/android.yml
+++ b/.github/workflows/android.yml
@@ -36,15 +36,15 @@ jobs:
           branch: buildjre8
           name: jre8-pojav
 
-      - name: Get JRE17
+      - name: Get JRE21
         uses: dawidd6/action-download-artifact@v2
         with:
           workflow: build.yml
           path: app_solcraftlauncher/src/main/assets/components/jre-new
           workflow_conclusion: success
           repo: PojavLauncherTeam/android-openjdk-build-multiarch
-          branch: buildjre17
-          name: jre17-pojav
+          branch: buildjre21
+          name: jre21-pojav
 
       - uses: gradle/gradle-build-action@v2
         with:
diff --git a/app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/JRE17Util.java b/app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/JRE21Util.java
similarity index 90%
rename from app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/JRE17Util.java
rename to app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/JRE21Util.java
index 1cd0dca35b..c88e497f07 100644
--- a/app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/JRE17Util.java
+++ b/app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/JRE21Util.java
@@ -13,8 +13,8 @@
 
 import java.io.IOException;
 
-public class JRE17Util {
-    public static final String NEW_JRE_NAME = "Internal-17";
+public class JRE21Util {
+    public static final String NEW_JRE_NAME = "Internal-21";
     public static boolean checkInternalNewJre(AssetManager assetManager) {
         String launcher_jre17_version;
         String installed_jre17_version = MultiRTUtils.__internal__readBinpackVersion(NEW_JRE_NAME);
@@ -35,8 +35,8 @@ private static boolean unpackJre17(AssetManager assetManager, String rt_version)
             MultiRTUtils.installRuntimeNamedBinpack(
                     assetManager.open("components/jre-new/universal.tar.xz"),
                     assetManager.open("components/jre-new/bin-" + archAsString(Tools.DEVICE_ARCHITECTURE) + ".tar.xz"),
-                    "Internal-17", rt_version);
-            MultiRTUtils.postPrepare("Internal-17");
+                    "Internal-21", rt_version);
+            MultiRTUtils.postPrepare("Internal-21");
             return true;
         }catch (IOException e) {
             Log.e("JRE17Auto", "Internal JRE unpack failed", e);
@@ -67,18 +67,18 @@ public static boolean installNewJreIfNeeded(Activity activity, JMinecraftVersion
 
         String appropriateRuntime = MultiRTUtils.getNearestJreName(versionInfo.javaVersion.majorVersion);
         if (appropriateRuntime != null) {
-            if (JRE17Util.isInternalNewJRE(appropriateRuntime)) {
-                JRE17Util.checkInternalNewJre(activity.getAssets());
+            if (JRE21Util.isInternalNewJRE(appropriateRuntime)) {
+                JRE21Util.checkInternalNewJre(activity.getAssets());
             }
             minecraftProfile.javaDir = Tools.LAUNCHERPROFILES_RTPREFIX + appropriateRuntime;
             LauncherProfiles.load();
         } else {
             if (versionInfo.javaVersion.majorVersion <= 17) { // there's a chance we have an internal one for this case
-                if (!JRE17Util.checkInternalNewJre(activity.getAssets())){
+                if (!JRE21Util.checkInternalNewJre(activity.getAssets())){
                     showRuntimeFail(activity, versionInfo);
                     return false;
                 } else {
-                    minecraftProfile.javaDir = Tools.LAUNCHERPROFILES_RTPREFIX + JRE17Util.NEW_JRE_NAME;
+                    minecraftProfile.javaDir = Tools.LAUNCHERPROFILES_RTPREFIX + JRE21Util.NEW_JRE_NAME;
                     LauncherProfiles.load();
                 }
             } else {
diff --git a/app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/tasks/MinecraftDownloader.java b/app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/tasks/MinecraftDownloader.java
index 167c165382..0ad0900ea4 100644
--- a/app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/tasks/MinecraftDownloader.java
+++ b/app_solcraftlauncher/src/main/java/net/kdt/pojavlaunch/tasks/MinecraftDownloader.java
@@ -13,7 +13,7 @@
 import net.kdt.pojavlaunch.JAssetInfo;
 import net.kdt.pojavlaunch.JAssets;
 import net.kdt.pojavlaunch.JMinecraftVersionList;
-import net.kdt.pojavlaunch.JRE17Util;
+import net.kdt.pojavlaunch.JRE21Util;
 import net.kdt.pojavlaunch.R;
 import net.kdt.pojavlaunch.Tools;
 import net.kdt.pojavlaunch.mirrors.DownloadMirror;
@@ -203,7 +203,7 @@ private boolean downloadAndProcessMetadata(Activity activity, JMinecraftVersionL
             throw new IOException("Unable to read Version JSON for version " + versionName);
         }
 
-        if(activity != null && !JRE17Util.installNewJreIfNeeded(activity, verInfo)){
+        if(activity != null && !JRE21Util.installNewJreIfNeeded(activity, verInfo)){
             return false;
         }