diff --git a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/ConstructorTransformerMethodVisitor.java b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/ConstructorTransformerMethodVisitor.java
index ace1110..9bd76dd 100644
--- a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/ConstructorTransformerMethodVisitor.java
+++ b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/ConstructorTransformerMethodVisitor.java
@@ -20,7 +20,7 @@ public class ConstructorTransformerMethodVisitor extends MethodNode {
 	private MethodVisitor next;
 
 	public ConstructorTransformerMethodVisitor(MethodVisitor next, final int access, final String name, final String desc, final String signature, final String[] exceptions, String className) {
-		super(Opcodes.ASM7, access, name, desc, signature, exceptions);
+		super(Opcodes.ASM9, access, name, desc, signature, exceptions);
 		this.next = next;
 		this.className = className;
 	}
diff --git a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/ScopeExtractorMethodVisitor.java b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/ScopeExtractorMethodVisitor.java
index 7a4f2b1..b62db3d 100644
--- a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/ScopeExtractorMethodVisitor.java
+++ b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/ScopeExtractorMethodVisitor.java
@@ -45,7 +45,7 @@ public class ScopeExtractorMethodVisitor extends MethodNode {
 	private Map<VarAndStoreOpcode, List<Label>> varAccesses;
 	
 	ScopeExtractorMethodVisitor(StateTrackingMethodVisitor next, final int access, final String name, final String desc, final String signature, final String[] exceptions) {
-		super(Opcodes.ASM7, access, name, desc, signature, exceptions);
+		super(Opcodes.ASM9, access, name, desc, signature, exceptions);
 		this.next = next;
 		lineNumberToFirstOccurrenceOfVariables = new HashMap<>();
 		varAccesses = new HashMap<>();
diff --git a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/StateTrackingClassVisitor.java b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/StateTrackingClassVisitor.java
index 1ce9c74..270234f 100644
--- a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/StateTrackingClassVisitor.java
+++ b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/StateTrackingClassVisitor.java
@@ -25,7 +25,7 @@ public class StateTrackingClassVisitor extends ClassVisitor {
 	private InstrumentationActions instrumentationActions;
 	
 	public StateTrackingClassVisitor(ClassVisitor cv, InstrumentationActions instrumentationActions) {
-		super(Opcodes.ASM7, cv);
+		super(Opcodes.ASM9, cv);
 		this.instrumentationActions = instrumentationActions;
 	}
 	
diff --git a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/StateTrackingMethodVisitor.java b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/StateTrackingMethodVisitor.java
index c6da635..43c38e8 100644
--- a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/StateTrackingMethodVisitor.java
+++ b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/StateTrackingMethodVisitor.java
@@ -46,7 +46,7 @@ public class StateTrackingMethodVisitor extends MethodVisitor {
 
 
 	StateTrackingMethodVisitor(MethodVisitor mv, InstrumentationActions instrumentationActions, String className, String methodName, String desc) {
-		super(Opcodes.ASM7, mv);
+		super(Opcodes.ASM9, mv);
 		
 		this.logger = new Logger(instrumentationActions.verboseLogging);
 		
diff --git a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/param/DiscoveryClassVisitor.java b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/param/DiscoveryClassVisitor.java
index 16eec90..a0c8271 100644
--- a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/param/DiscoveryClassVisitor.java
+++ b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/param/DiscoveryClassVisitor.java
@@ -27,7 +27,7 @@ public class DiscoveryClassVisitor extends ClassVisitor {
 
 
 	public DiscoveryClassVisitor(Configuration configuration) {
-		super(Opcodes.ASM7);
+		super(Opcodes.ASM9);
 		this.configuration = configuration;
 		this.transformationParameters = new InstrumentationActions.Builder();
 	}
diff --git a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/param/DiscoveryMethodVisitor.java b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/param/DiscoveryMethodVisitor.java
index 9928272..368126f 100644
--- a/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/param/DiscoveryMethodVisitor.java
+++ b/scott/src/main/java/hu/advancedweb/scott/instrumentation/transformation/param/DiscoveryMethodVisitor.java
@@ -31,7 +31,7 @@ public class DiscoveryMethodVisitor extends MethodVisitor {
 
 	DiscoveryMethodVisitor(MethodVisitor mv, InstrumentationActions.Builder instrumentationActions,
 			Configuration configuration, String name, String desc, String signature, List<String> classAnnotationFqns) {
-		super(Opcodes.ASM7, mv);
+		super(Opcodes.ASM9, mv);
 		this.instrumentationActions = instrumentationActions;
 		this.configuration = configuration;
 		this.methodName = name;