diff --git a/build.gradle b/build.gradle
index 1859ac7..a827dec 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@ repositories {
 }
 
 dependencies {
-	compile 'org.ow2.asm:asm:6.2.1'
+	compile 'org.ow2.asm:asm:7.0'
 	testCompile 'junit:junit:4.12'
 }
 
diff --git a/src/main/java/moe/yushi/authlibinjector/transform/AuthlibLogInterceptor.java b/src/main/java/moe/yushi/authlibinjector/transform/AuthlibLogInterceptor.java
index 47f0446..d258525 100644
--- a/src/main/java/moe/yushi/authlibinjector/transform/AuthlibLogInterceptor.java
+++ b/src/main/java/moe/yushi/authlibinjector/transform/AuthlibLogInterceptor.java
@@ -1,6 +1,6 @@
 package moe.yushi.authlibinjector.transform;
 
-import static org.objectweb.asm.Opcodes.ASM6;
+import static org.objectweb.asm.Opcodes.ASM7;
 import static org.objectweb.asm.Opcodes.INVOKESTATIC;
 import static org.objectweb.asm.Opcodes.INVOKEVIRTUAL;
 
@@ -203,7 +203,7 @@ public class AuthlibLogInterceptor implements TransformUnit {
 					return Optional.empty();
 				}
 			}
-			return Optional.of(new ClassVisitor(ASM6, writer) {
+			return Optional.of(new ClassVisitor(ASM7, writer) {
 
 				@Override
 				public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
diff --git a/src/main/java/moe/yushi/authlibinjector/transform/LdcTransformUnit.java b/src/main/java/moe/yushi/authlibinjector/transform/LdcTransformUnit.java
index bdd9785..dc2e39c 100644
--- a/src/main/java/moe/yushi/authlibinjector/transform/LdcTransformUnit.java
+++ b/src/main/java/moe/yushi/authlibinjector/transform/LdcTransformUnit.java
@@ -1,6 +1,6 @@
 package moe.yushi.authlibinjector.transform;
 
-import static org.objectweb.asm.Opcodes.ASM6;
+import static org.objectweb.asm.Opcodes.ASM7;
 import java.util.Optional;
 import org.objectweb.asm.ClassVisitor;
 import org.objectweb.asm.MethodVisitor;
@@ -9,11 +9,11 @@ public abstract class LdcTransformUnit implements TransformUnit {
 
 	@Override
 	public Optional<ClassVisitor> transform(ClassLoader classLoader, String className, ClassVisitor writer, Runnable modifiedCallback) {
-		return Optional.of(new ClassVisitor(ASM6, writer) {
+		return Optional.of(new ClassVisitor(ASM7, writer) {
 
 			@Override
 			public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
-				return new MethodVisitor(ASM6, super.visitMethod(access, name, desc, signature, exceptions)) {
+				return new MethodVisitor(ASM7, super.visitMethod(access, name, desc, signature, exceptions)) {
 
 					@Override
 					public void visitLdcInsn(Object cst) {
diff --git a/src/main/java/moe/yushi/authlibinjector/transform/SkinWhitelistTransformUnit.java b/src/main/java/moe/yushi/authlibinjector/transform/SkinWhitelistTransformUnit.java
index 54c610a..dccd68d 100644
--- a/src/main/java/moe/yushi/authlibinjector/transform/SkinWhitelistTransformUnit.java
+++ b/src/main/java/moe/yushi/authlibinjector/transform/SkinWhitelistTransformUnit.java
@@ -2,7 +2,7 @@ package moe.yushi.authlibinjector.transform;
 
 import static org.objectweb.asm.Opcodes.AASTORE;
 import static org.objectweb.asm.Opcodes.ANEWARRAY;
-import static org.objectweb.asm.Opcodes.ASM6;
+import static org.objectweb.asm.Opcodes.ASM7;
 import static org.objectweb.asm.Opcodes.DUP;
 import static org.objectweb.asm.Opcodes.ICONST_0;
 import static org.objectweb.asm.Opcodes.ICONST_1;
@@ -23,12 +23,12 @@ public class SkinWhitelistTransformUnit implements TransformUnit {
 	@Override
 	public Optional<ClassVisitor> transform(ClassLoader classLoader, String className, ClassVisitor writer, Runnable modifiedCallback) {
 		if ("com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService".equals(className)) {
-			return Optional.of(new ClassVisitor(ASM6, writer) {
+			return Optional.of(new ClassVisitor(ASM7, writer) {
 
 				@Override
 				public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
 					if ("<clinit>".equals(name)) {
-						return new MethodVisitor(ASM6, super.visitMethod(access, name, desc, signature, exceptions)) {
+						return new MethodVisitor(ASM7, super.visitMethod(access, name, desc, signature, exceptions)) {
 
 							int status = 0;
 
diff --git a/src/main/java/moe/yushi/authlibinjector/transform/YggdrasilKeyTransformUnit.java b/src/main/java/moe/yushi/authlibinjector/transform/YggdrasilKeyTransformUnit.java
index 77f0007..24717a6 100644
--- a/src/main/java/moe/yushi/authlibinjector/transform/YggdrasilKeyTransformUnit.java
+++ b/src/main/java/moe/yushi/authlibinjector/transform/YggdrasilKeyTransformUnit.java
@@ -4,7 +4,7 @@ import static org.objectweb.asm.Opcodes.ACC_PRIVATE;
 import static org.objectweb.asm.Opcodes.ACC_STATIC;
 import static org.objectweb.asm.Opcodes.ACC_SYNTHETIC;
 import static org.objectweb.asm.Opcodes.ALOAD;
-import static org.objectweb.asm.Opcodes.ASM6;
+import static org.objectweb.asm.Opcodes.ASM7;
 import static org.objectweb.asm.Opcodes.ASTORE;
 import static org.objectweb.asm.Opcodes.CHECKCAST;
 import static org.objectweb.asm.Opcodes.F_APPEND;
@@ -40,7 +40,7 @@ public class YggdrasilKeyTransformUnit implements TransformUnit {
 	@Override
 	public Optional<ClassVisitor> transform(ClassLoader classLoader, String className, ClassVisitor writer, Runnable modifiedCallback) {
 		if ("com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService".equals(className)) {
-			return Optional.of(new ClassVisitor(ASM6, writer) {
+			return Optional.of(new ClassVisitor(ASM7, writer) {
 
 				@Override
 				public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
@@ -94,7 +94,7 @@ public class YggdrasilKeyTransformUnit implements TransformUnit {
 
 				@Override
 				public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
-					return new MethodVisitor(ASM6, super.visitMethod(access, name, desc, signature, exceptions)) {
+					return new MethodVisitor(ASM7, super.visitMethod(access, name, desc, signature, exceptions)) {
 						@Override
 						public void visitMethodInsn(int opcode, String owner, String name, String descriptor, boolean isInterface) {
 							if (opcode == INVOKEVIRTUAL
diff --git a/src/main/java/moe/yushi/authlibinjector/transform/support/CitizensTransformer.java b/src/main/java/moe/yushi/authlibinjector/transform/support/CitizensTransformer.java
index acdc26a..4613c63 100644
--- a/src/main/java/moe/yushi/authlibinjector/transform/support/CitizensTransformer.java
+++ b/src/main/java/moe/yushi/authlibinjector/transform/support/CitizensTransformer.java
@@ -1,7 +1,7 @@
 package moe.yushi.authlibinjector.transform.support;
 
 import static org.objectweb.asm.Opcodes.ALOAD;
-import static org.objectweb.asm.Opcodes.ASM6;
+import static org.objectweb.asm.Opcodes.ASM7;
 import static org.objectweb.asm.Opcodes.F_SAME;
 import static org.objectweb.asm.Opcodes.GETFIELD;
 import static org.objectweb.asm.Opcodes.IFEQ;
@@ -28,12 +28,12 @@ public class CitizensTransformer implements TransformUnit {
 	@Override
 	public Optional<ClassVisitor> transform(ClassLoader classLoader, String className, ClassVisitor writer, Runnable modifiedCallback) {
 		if ("net.citizensnpcs.Settings$Setting".equals(className)) {
-			return Optional.of(new ClassVisitor(ASM6, writer) {
+			return Optional.of(new ClassVisitor(ASM7, writer) {
 				@Override
 				public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
 					if (("loadFromKey".equals(name) || "setAtKey".equals(name))
 							&& "(Lnet/citizensnpcs/api/util/DataKey;)V".equals(descriptor)) {
-						return new MethodVisitor(ASM6, super.visitMethod(access, name, descriptor, signature, exceptions)) {
+						return new MethodVisitor(ASM7, super.visitMethod(access, name, descriptor, signature, exceptions)) {
 							@Override
 							public void visitCode() {
 								super.visitCode();