diff --git a/src/main/java/the/bytecode/club/bytecodeviewer/Constants.java b/src/main/java/the/bytecode/club/bytecodeviewer/Constants.java
index 9b7e036d..be74f178 100644
--- a/src/main/java/the/bytecode/club/bytecodeviewer/Constants.java
+++ b/src/main/java/the/bytecode/club/bytecodeviewer/Constants.java
@@ -1,5 +1,6 @@
 package the.bytecode.club.bytecodeviewer;
 
+import org.objectweb.asm.Opcodes;
 import the.bytecode.club.bytecodeviewer.resources.ResourceType;
 
 import java.io.File;
@@ -38,6 +39,7 @@ public class Constants
 	public static String krakatauWorkingDirectory = getBCVDirectory() + fs + "krakatau_" + krakatauVersion;
 	public static String enjarifyWorkingDirectory = getBCVDirectory() + fs + "enjarify_" + enjarifyVersion;
 	public static final String[] SUPPORTED_FILE_EXTENSIONS = ResourceType.supportedBCVExtensionMap.keySet().toArray(new String[0]);
+	public static final int ASM_VERSION = Opcodes.ASM9;
 	
 	public static final PrintStream ERR = System.err;
 	public static final PrintStream OUT = System.out;
diff --git a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingAnnotationAdapter.java b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingAnnotationAdapter.java
index fb9f24f5..df86279c 100644
--- a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingAnnotationAdapter.java
+++ b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingAnnotationAdapter.java
@@ -31,8 +31,8 @@
 package the.bytecode.club.bytecodeviewer.obfuscators.mapping;
 
 import org.objectweb.asm.AnnotationVisitor;
-import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.commons.Remapper;
+import the.bytecode.club.bytecodeviewer.Constants;
 
 /**
  * An {@link AnnotationVisitor} adapter for type remapping.
@@ -45,7 +45,7 @@ public class RemappingAnnotationAdapter extends AnnotationVisitor {
 
     public RemappingAnnotationAdapter(final AnnotationVisitor av,
                                       final org.objectweb.asm.commons.Remapper remapper) {
-        this(Opcodes.ASM5, av, remapper);
+        this(Constants.ASM_VERSION, av, remapper);
     }
 
     protected RemappingAnnotationAdapter(final int api,
diff --git a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingClassAdapter.java b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingClassAdapter.java
index 3cf60119..2c65144f 100644
--- a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingClassAdapter.java
+++ b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingClassAdapter.java
@@ -34,8 +34,8 @@ import org.objectweb.asm.AnnotationVisitor;
 import org.objectweb.asm.ClassVisitor;
 import org.objectweb.asm.FieldVisitor;
 import org.objectweb.asm.MethodVisitor;
-import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.TypePath;
+import the.bytecode.club.bytecodeviewer.Constants;
 
 /**
  * A {@link ClassVisitor} for type remapping.
@@ -49,7 +49,7 @@ public class RemappingClassAdapter extends ClassVisitor {
     protected String className;
 
     public RemappingClassAdapter(final ClassVisitor cv, final Remapper remapper) {
-        this(Opcodes.ASM5, cv, remapper);
+        this(Constants.ASM_VERSION, cv, remapper);
     }
 
     protected RemappingClassAdapter(final int api, final ClassVisitor cv,
diff --git a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingFieldAdapter.java b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingFieldAdapter.java
index a493b0af..9167ed1a 100644
--- a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingFieldAdapter.java
+++ b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingFieldAdapter.java
@@ -32,9 +32,9 @@ package the.bytecode.club.bytecodeviewer.obfuscators.mapping;
 
 import org.objectweb.asm.AnnotationVisitor;
 import org.objectweb.asm.FieldVisitor;
-import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.TypePath;
 import org.objectweb.asm.commons.Remapper;
+import the.bytecode.club.bytecodeviewer.Constants;
 
 /**
  * A {@link FieldVisitor} adapter for type remapping.
@@ -46,7 +46,7 @@ public class RemappingFieldAdapter extends FieldVisitor {
     private final org.objectweb.asm.commons.Remapper remapper;
 
     public RemappingFieldAdapter(final FieldVisitor fv, final org.objectweb.asm.commons.Remapper remapper) {
-        this(Opcodes.ASM5, fv, remapper);
+        this(Constants.ASM_VERSION, fv, remapper);
     }
 
     protected RemappingFieldAdapter(final int api, final FieldVisitor fv,
diff --git a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingMethodAdapter.java b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingMethodAdapter.java
index 4746f461..f341fbd8 100644
--- a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingMethodAdapter.java
+++ b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingMethodAdapter.java
@@ -38,6 +38,7 @@ import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.TypePath;
 import org.objectweb.asm.commons.LocalVariablesSorter;
 import org.objectweb.asm.commons.Remapper;
+import the.bytecode.club.bytecodeviewer.Constants;
 
 /**
  * A {@link LocalVariablesSorter} for type mapping.
@@ -50,7 +51,7 @@ public class RemappingMethodAdapter extends LocalVariablesSorter {
 
     public RemappingMethodAdapter(final int access, final String desc,
                                   final MethodVisitor mv, final org.objectweb.asm.commons.Remapper remapper) {
-        this(Opcodes.ASM5, access, desc, mv, remapper);
+        this(Constants.ASM_VERSION, access, desc, mv, remapper);
     }
 
     protected RemappingMethodAdapter(final int api, final int access,
@@ -125,7 +126,7 @@ public class RemappingMethodAdapter extends LocalVariablesSorter {
     @Override
     public void visitMethodInsn(final int opcode, final String owner,
                                 final String name, final String desc) {
-        if (api >= Opcodes.ASM5) {
+        if (api >= Constants.ASM_VERSION) {
             super.visitMethodInsn(opcode, owner, name, desc);
             return;
         }
@@ -136,7 +137,7 @@ public class RemappingMethodAdapter extends LocalVariablesSorter {
     @Override
     public void visitMethodInsn(final int opcode, final String owner,
                                 final String name, final String desc, final boolean itf) {
-        if (api < Opcodes.ASM5) {
+        if (api < Constants.ASM_VERSION) {
             super.visitMethodInsn(opcode, owner, name, desc, itf);
             return;
         }
diff --git a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingSignatureAdapter.java b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingSignatureAdapter.java
index 92bb45e2..27316830 100644
--- a/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingSignatureAdapter.java
+++ b/src/main/java/the/bytecode/club/bytecodeviewer/obfuscators/mapping/RemappingSignatureAdapter.java
@@ -30,9 +30,9 @@
 
 package the.bytecode.club.bytecodeviewer.obfuscators.mapping;
 
-import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.commons.Remapper;
 import org.objectweb.asm.signature.SignatureVisitor;
+import the.bytecode.club.bytecodeviewer.Constants;
 
 /**
  * A {@link SignatureVisitor} adapter for type mapping.
@@ -49,7 +49,7 @@ public class RemappingSignatureAdapter extends SignatureVisitor {
 
     public RemappingSignatureAdapter(final SignatureVisitor v,
                                      final org.objectweb.asm.commons.Remapper remapper) {
-        this(Opcodes.ASM5, v, remapper);
+        this(Constants.ASM_VERSION, v, remapper);
     }
 
     protected RemappingSignatureAdapter(final int api,