diff --git a/src/main/java/dev/architectury/loom/forge/FieldMappingsMigrator.java b/src/main/java/dev/architectury/loom/forge/FieldMappingsMigrator.java
index 766fa414..e7b7aef6 100644
--- a/src/main/java/dev/architectury/loom/forge/FieldMappingsMigrator.java
+++ b/src/main/java/dev/architectury/loom/forge/FieldMappingsMigrator.java
@@ -48,13 +48,13 @@ import org.gradle.api.Project;
 import org.objectweb.asm.ClassReader;
 import org.objectweb.asm.ClassVisitor;
 import org.objectweb.asm.FieldVisitor;
-import org.objectweb.asm.Opcodes;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import net.fabricmc.loom.LoomGradleExtension;
 import net.fabricmc.loom.api.mappings.layered.MappingsNamespace;
 import net.fabricmc.loom.configuration.providers.minecraft.MinecraftProvider;
+import net.fabricmc.loom.util.Constants;
 import net.fabricmc.loom.util.FileSystemUtil;
 import net.fabricmc.mappingio.MappingReader;
 import net.fabricmc.mappingio.format.tiny.Tiny2FileWriter;
@@ -183,7 +183,7 @@ public final class FieldMappingsMigrator implements MappingsMigrator {
 			}
 		}
 
-		Visitor visitor = new Visitor(Opcodes.ASM9);
+		Visitor visitor = new Visitor(Constants.ASM_VERSION);
 		FileSystemUtil.Delegate system = FileSystemUtil.getJarFileSystem(patchedJar, false);
 		completer.onComplete(value -> system.close());
 
diff --git a/src/main/java/dev/architectury/loom/forge/MethodInheritanceMappingsMigrator.java b/src/main/java/dev/architectury/loom/forge/MethodInheritanceMappingsMigrator.java
index 53dbde0c..8c90d06f 100644
--- a/src/main/java/dev/architectury/loom/forge/MethodInheritanceMappingsMigrator.java
+++ b/src/main/java/dev/architectury/loom/forge/MethodInheritanceMappingsMigrator.java
@@ -48,11 +48,11 @@ import org.gradle.api.logging.Logger;
 import org.objectweb.asm.ClassReader;
 import org.objectweb.asm.ClassVisitor;
 import org.objectweb.asm.MethodVisitor;
-import org.objectweb.asm.Opcodes;
 
 import net.fabricmc.loom.LoomGradleExtension;
 import net.fabricmc.loom.api.mappings.layered.MappingsNamespace;
 import net.fabricmc.loom.configuration.providers.minecraft.MinecraftProvider;
+import net.fabricmc.loom.util.Constants;
 import net.fabricmc.loom.util.FileSystemUtil;
 import net.fabricmc.loom.util.Pair;
 import net.fabricmc.mappingio.MappingReader;
@@ -182,7 +182,7 @@ public final class MethodInheritanceMappingsMigrator implements MappingsMigrator
 	private static Pair<Multimap<String, String>, Set<MethodKey>> collectClassesAndMethods(Iterable<Path> jars) throws IOException {
 		Multimap<String, String> classInheritanceMap = Multimap.setMultimap();
 		Set<MethodKey> methods = new HashSet<>();
-		Visitor visitor = new Visitor(Opcodes.ASM9, classInheritanceMap, methods);
+		Visitor visitor = new Visitor(Constants.ASM_VERSION, classInheritanceMap, methods);
 
 		for (Path jar : jars) {
 			try (FileSystemUtil.Delegate system = FileSystemUtil.getJarFileSystem(jar, false)) {
diff --git a/src/main/java/dev/architectury/loom/forge/ModDirTransformerDiscovererPatch.java b/src/main/java/dev/architectury/loom/forge/ModDirTransformerDiscovererPatch.java
index 0bd59456..7488f297 100644
--- a/src/main/java/dev/architectury/loom/forge/ModDirTransformerDiscovererPatch.java
+++ b/src/main/java/dev/architectury/loom/forge/ModDirTransformerDiscovererPatch.java
@@ -5,6 +5,8 @@ import org.objectweb.asm.Label;
 import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Opcodes;
 
+import net.fabricmc.loom.util.Constants;
+
 /**
  * Patches {@code ModDirTransformerDiscovererPatch} in Forge 49.0.50+ so that it doesn't try to create modules
  * directly out of UnionFS root paths created by Union Relauncher. SecureModules can't infer the module names
@@ -12,7 +14,7 @@ import org.objectweb.asm.Opcodes;
  */
 public final class ModDirTransformerDiscovererPatch extends ClassVisitor {
 	public ModDirTransformerDiscovererPatch(ClassVisitor classVisitor) {
-		super(Opcodes.ASM9, classVisitor);
+		super(Constants.ASM_VERSION, classVisitor);
 	}
 
 	@Override
@@ -20,7 +22,7 @@ public final class ModDirTransformerDiscovererPatch extends ClassVisitor {
 		MethodVisitor next = super.visitMethod(access, name, descriptor, signature, exceptions);
 
 		if (name.equals("isServiceProvider") && descriptor.equals("(Ljava/nio/file/Path;)Z")) {
-			return new MethodVisitor(Opcodes.ASM9, next) {
+			return new MethodVisitor(Constants.ASM_VERSION, next) {
 				@Override
 				public void visitCode() {
 					super.visitCode();
diff --git a/src/main/java/dev/architectury/loom/forge/minecraft/MinecraftPatchedProvider.java b/src/main/java/dev/architectury/loom/forge/minecraft/MinecraftPatchedProvider.java
index 9fecb27b..93fe52db 100644
--- a/src/main/java/dev/architectury/loom/forge/minecraft/MinecraftPatchedProvider.java
+++ b/src/main/java/dev/architectury/loom/forge/minecraft/MinecraftPatchedProvider.java
@@ -78,7 +78,6 @@ import org.objectweb.asm.ClassVisitor;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.Label;
 import org.objectweb.asm.MethodVisitor;
-import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.tree.ClassNode;
 
 import net.fabricmc.loom.LoomGradleExtension;
@@ -339,10 +338,10 @@ public class MinecraftPatchedProvider {
 					ClassReader reader = new ClassReader(bytes);
 					ClassWriter writer = new ClassWriter(0);
 
-					reader.accept(new ClassVisitor(Opcodes.ASM9, writer) {
+					reader.accept(new ClassVisitor(Constants.ASM_VERSION, writer) {
 						@Override
 						public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
-							return new MethodVisitor(Opcodes.ASM9, super.visitMethod(access, name, descriptor, signature, exceptions)) {
+							return new MethodVisitor(Constants.ASM_VERSION, super.visitMethod(access, name, descriptor, signature, exceptions)) {
 								@Override
 								public void visitParameter(String name, int access) {
 									if (name != null && vignetteParameters.matcher(name).matches()) {
diff --git a/src/main/java/dev/architectury/loom/neoforge/LaunchHandlerPatcher.java b/src/main/java/dev/architectury/loom/neoforge/LaunchHandlerPatcher.java
index 1429499a..cb95f966 100644
--- a/src/main/java/dev/architectury/loom/neoforge/LaunchHandlerPatcher.java
+++ b/src/main/java/dev/architectury/loom/neoforge/LaunchHandlerPatcher.java
@@ -2,7 +2,8 @@ package dev.architectury.loom.neoforge;
 
 import org.objectweb.asm.ClassVisitor;
 import org.objectweb.asm.MethodVisitor;
-import org.objectweb.asm.Opcodes;
+
+import net.fabricmc.loom.util.Constants;
 
 /*
  * Patches the Minecraft.class check in FML's CommonUserdevLaunchHandler
@@ -15,7 +16,7 @@ public final class LaunchHandlerPatcher extends ClassVisitor {
 	private static final String OUTPUT_CLASS_FILE = "net/minecraft/client/main/Main.class";
 
 	public LaunchHandlerPatcher(ClassVisitor next) {
-		super(Opcodes.ASM9, next);
+		super(Constants.ASM_VERSION, next);
 	}
 
 	@Override
@@ -25,7 +26,7 @@ public final class LaunchHandlerPatcher extends ClassVisitor {
 
 	private static final class MethodPatcher extends MethodVisitor {
 		MethodPatcher(MethodVisitor next) {
-			super(Opcodes.ASM9, next);
+			super(Constants.ASM_VERSION, next);
 		}
 
 		@Override