diff --git a/LocatorLoader/build.gradle b/LocatorLoader/build.gradle
index ba9ac9c..3f5fe49 100644
--- a/LocatorLoader/build.gradle
+++ b/LocatorLoader/build.gradle
@@ -40,7 +40,8 @@ dependencies {
     implementation("org.ow2.asm:asm:9.3")
     implementation("org.ow2.asm:asm-tree:9.3")
     implementation("org.ow2.asm:asm-commons:9.3")
-    implementation "cpw.mods:modlauncher:2.1.+"
+    implementation "cpw.mods:modlauncher:8.1.3"
+    implementation "cpw.mods:securejarhandler:2.1.6"
     implementation 'org.jetbrains:annotations:23.1.0'
     implementation "org.apache.logging.log4j:log4j-api:2.19.0"
 }
diff --git a/LocatorLoader/src/main/java/me/xfl03/morecrashinfo/modlauncher/ClasspathHelper.java b/LocatorLoader/src/main/java/me/xfl03/morecrashinfo/modlauncher/ClasspathHelper.java
index 1ec6725..3dff488 100644
--- a/LocatorLoader/src/main/java/me/xfl03/morecrashinfo/modlauncher/ClasspathHelper.java
+++ b/LocatorLoader/src/main/java/me/xfl03/morecrashinfo/modlauncher/ClasspathHelper.java
@@ -1,13 +1,17 @@
 package me.xfl03.morecrashinfo.modlauncher;
 
+import cpw.mods.cl.JarModuleFinder;
+import cpw.mods.jarhandling.SecureJar;
 import sun.misc.Unsafe;
 
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.net.URL;
 import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.Collection;
+import java.util.*;
 
 public class ClasspathHelper {
     public static void add(ClassLoader classLoader, Path file) throws Throwable {
@@ -17,6 +21,7 @@ public static void add(ClassLoader classLoader, Path file) throws Throwable {
                 Method addURLMethod = classLoaderClass.getDeclaredMethod("addURL", URL.class);
                 addURLMethod.setAccessible(true);
                 addURLMethod.invoke(classLoader, file.toUri().toURL());
+                TransformerService.logger.info("Added {} to {}", file, classLoader);
                 return;
             }
         } catch (ClassNotFoundException ignored) {
@@ -30,14 +35,36 @@ public static void add(ClassLoader classLoader, Path file) throws Throwable {
                 Unsafe unsafe = (Unsafe) unsafeField.get(null);
                 Field ucpField = findDeclaredField(classLoaderClass, "ucp");
                 long ucpFieldOffset = unsafe.objectFieldOffset(ucpField);
+//                System.out.println("1 " + classLoader + ucpFieldOffset);
                 Object ucpObject = unsafe.getObject(classLoader, ucpFieldOffset);
+                if (ucpObject == null) {
+                    //PlatformClassLoader
+                    //Get IMPL_LOOKUP
+                    Field implLookupField = MethodHandles.Lookup.class.getDeclaredField("IMPL_LOOKUP");
+                    MethodHandles.Lookup lookup = (MethodHandles.Lookup)
+                            unsafe.getObject(unsafe.staticFieldBase(implLookupField),
+                                    unsafe.staticFieldOffset(implLookupField));
+
+                    //Invoke loadModule
+                    Class<?> moduleReferenceClass = Class.forName("java.lang.module.ModuleReference");
+                    MethodHandle mh = lookup.findVirtual(classLoaderClass, "loadModule",
+                            MethodType.methodType(void.class, moduleReferenceClass));
+//                    mh.bindTo(classLoader);
+                    JarModuleFinder finder = JarModuleFinder.of(SecureJar.from(file));
+                    finder.findAll().forEach(it -> tryInvoke(mh, Arrays.asList(classLoader, it)));
+                    TransformerService.logger.info("Added {} to {}", file, classLoader);
+                    return;
+//                    throw new IllegalStateException("ucp is null");
+                }
                 Class<?> classPathClass = Class.forName("jdk.internal.loader.URLClassPath");
                 Field pathField = classPathClass.getDeclaredField("path");
                 long pathFieldOffset = unsafe.objectFieldOffset(pathField);
+//                System.out.println("2 " + ucpObject + pathFieldOffset);
                 // noinspection ALL
                 ArrayList<URL> path = (ArrayList<URL>) unsafe.getObject(ucpObject, pathFieldOffset);
                 Field urlsField = findDeclaredField(classPathClass, "urls", "unopenedUrls");
                 long urlsFieldOffset = unsafe.objectFieldOffset(urlsField);
+//                System.out.println("3 " + ucpObject + urlsFieldOffset);
                 // noinspection ALL
                 Collection<URL> urls = (Collection<URL>) unsafe.getObject(ucpObject, urlsFieldOffset);
                 // noinspection ALL
@@ -47,6 +74,7 @@ public static void add(ClassLoader classLoader, Path file) throws Throwable {
                         path.add(file.toUri().toURL());
                     }
                 }
+                TransformerService.logger.info("Added {} to {}", file, classLoader);
                 return;
             }
         } catch (ClassNotFoundException ignored) {
@@ -69,4 +97,12 @@ private static Field findDeclaredField(Class<?> type, String... names) throws No
         }
         throw new NoSuchFieldException(String.join(", ", names));
     }
+
+    private static void tryInvoke(MethodHandle method, List<Object> args) {
+        try {
+            method.invokeWithArguments(args);
+        } catch (Throwable e) {
+            TransformerService.logger.warn("Error invoke method: {}", e.toString());
+        }
+    }
 }
\ No newline at end of file
diff --git a/LocatorLoader/src/main/java/me/xfl03/morecrashinfo/modlauncher/TransformerService.java b/LocatorLoader/src/main/java/me/xfl03/morecrashinfo/modlauncher/TransformerService.java
index 26f174d..0916905 100644
--- a/LocatorLoader/src/main/java/me/xfl03/morecrashinfo/modlauncher/TransformerService.java
+++ b/LocatorLoader/src/main/java/me/xfl03/morecrashinfo/modlauncher/TransformerService.java
@@ -61,19 +61,23 @@ public void initialize(IEnvironment environment) {
                     String.format("tmp/MoreCrashInfo-Locator-%s.jar", VersionUtil.getMinecraftVersion()));
             JarRemapper remapper = new JarRemapper();
             remapper.processJar(modPath, mapped);
-            try {
-                ClasspathHelper.add(Launcher.class.getClassLoader(), mapped);
-                return;
-            } catch (Throwable e) {
-                logger.warn("Error while appendToClassPath {}", Launcher.class.getClassLoader());
-                logger.warn(e);
-            }
-            try {
-                Method method = ClassLoader.class.getMethod("getPlatformClassLoader");
-                ClasspathHelper.add((ClassLoader) method.invoke(null), mapped);
-            } catch (Throwable e) {
-                logger.warn("Error while appendToClassPath getPlatformClassLoader");
-                logger.warn(e);
+            if (VersionUtil.getMinecraftMajorVersion() < 17) {
+                //Before 1.17, we can add jar to AppClassLoader
+                try {
+                    ClasspathHelper.add(Launcher.class.getClassLoader(), mapped);
+                } catch (Throwable e) {
+                    logger.warn("Error while appendToClassPath {}", Launcher.class.getClassLoader());
+                    logger.warn(e);
+                }
+            } else {
+                //After 1.17, we need to add jar as module to PlatformClassLoader
+                try {
+                    Method method = ClassLoader.class.getMethod("getPlatformClassLoader");
+                    ClasspathHelper.add((ClassLoader) method.invoke(null), mapped);
+                } catch (Throwable e) {
+                    logger.warn("Error while appendToClassPath getPlatformClassLoader");
+                    logger.warn(e);
+                }
             }
         }
     }
diff --git a/LocatorLoader/src/main/resources/META-INF/services/net.minecraftforge.forgespi.locating.IModLocator b/LocatorLoader/src/main/resources/META-INF/services/unused.net.minecraftforge.forgespi.locating.IModLocator
similarity index 100%
rename from LocatorLoader/src/main/resources/META-INF/services/net.minecraftforge.forgespi.locating.IModLocator
rename to LocatorLoader/src/main/resources/META-INF/services/unused.net.minecraftforge.forgespi.locating.IModLocator