diff --git a/src/main/java/moe/yushi/authlibinjector/AuthlibInjector.java b/src/main/java/moe/yushi/authlibinjector/AuthlibInjector.java
index 97bd342..07c9d1d 100644
--- a/src/main/java/moe/yushi/authlibinjector/AuthlibInjector.java
+++ b/src/main/java/moe/yushi/authlibinjector/AuthlibInjector.java
@@ -261,7 +261,7 @@ public final class AuthlibInjector {
 		URLProcessor urlProcessor = new URLProcessor(createFilters(config), new DefaultURLRedirector(config));
 
 		ClassTransformer transformer = new ClassTransformer();
-		transformer.ignores.addAll(Config.ignoredPackages);
+		transformer.setIgnores(Config.ignoredPackages);
 
 		if (Config.dumpClass) {
 			transformer.listeners.add(new DumpClassListener(Paths.get("").toAbsolutePath()));
diff --git a/src/main/java/moe/yushi/authlibinjector/Config.java b/src/main/java/moe/yushi/authlibinjector/Config.java
index bace476..a5293fe 100644
--- a/src/main/java/moe/yushi/authlibinjector/Config.java
+++ b/src/main/java/moe/yushi/authlibinjector/Config.java
@@ -107,39 +107,6 @@ public final class Config {
 			"com.sun.",
 			"sun.",
 			"net.java.",
-
-			"com.google.",
-			"com.ibm.",
-			"com.jcraft.jogg.",
-			"com.jcraft.jorbis.",
-			"com.oracle.",
-			"com.paulscode.",
-
-			"org.GNOME.",
-			"org.apache.",
-			"org.graalvm.",
-			"org.jcp.",
-			"org.json.",
-			"org.lwjgl.",
-			"com.mojang.blaze3d.",
-			"com.mojang.brigadier.",
-			"com.mojang.datafixers.",
-			"com.mojang.serialization.",
-			"org.objectweb.asm.",
-			"org.slf4j.",
-			"org.w3c.",
-			"org.xml.",
-			"org.yaml.snakeyaml.",
-
-			"gnu.trove.",
-			"io.netty.",
-			"it.unimi.dsi.fastutil.",
-			"javassist.",
-			"jline.",
-			"joptsimple.",
-			"oracle.",
-			"oshi.",
-			"paulscode.",
 	};
 
 	private static void initIgnoredPackages() {
diff --git a/src/main/java/moe/yushi/authlibinjector/transform/ClassTransformer.java b/src/main/java/moe/yushi/authlibinjector/transform/ClassTransformer.java
index a1a57e6..7e484aa 100644
--- a/src/main/java/moe/yushi/authlibinjector/transform/ClassTransformer.java
+++ b/src/main/java/moe/yushi/authlibinjector/transform/ClassTransformer.java
@@ -27,11 +27,10 @@ import java.lang.instrument.ClassFileTransformer;
 import java.lang.instrument.IllegalClassFormatException;
 import java.security.ProtectionDomain;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 import org.objectweb.asm.ClassReader;
 import org.objectweb.asm.ClassVisitor;
@@ -43,8 +42,8 @@ public class ClassTransformer implements ClassFileTransformer {
 
 	public final List<TransformUnit> units = new CopyOnWriteArrayList<>();
 	public final List<ClassLoadingListener> listeners = new CopyOnWriteArrayList<>();
-	public final Set<String> ignores = Collections.newSetFromMap(new ConcurrentHashMap<>());
 	public final PerformanceMetrics performanceMetrics = new PerformanceMetrics();
+	private String[] ignores = new String[0];
 
 	private class TransformHandle {
 
@@ -224,8 +223,8 @@ public class ClassTransformer implements ClassFileTransformer {
 				long t0 = System.nanoTime();
 
 				String className = internalClassName.replace('/', '.');
-				for (String prefix : ignores) {
-					if (className.startsWith(prefix)) {
+				for (String ignore : ignores) {
+					if (className.startsWith(ignore)) {
 						listeners.forEach(it -> it.onClassLoading(loader, className, classfileBuffer, Collections.emptyList()));
 
 						long t1 = System.nanoTime();
@@ -281,4 +280,8 @@ public class ClassTransformer implements ClassFileTransformer {
 		}
 		return constants;
 	}
+
+	public void setIgnores(Collection<String> newIgnores) {
+		ignores = newIgnores.toArray(ignores);
+	}
 }