diff --git a/build.gradle b/build.gradle
index 846ed59..317a831 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ plugins {
 }
 
 group 'net.fabricmc'
-version '0.4.0'
+version '0.4.1'
 
 def ENV = System.getenv()
 version = version + (ENV.GITHUB_ACTIONS ? "" : "+local")
@@ -22,11 +22,11 @@ dependencies {
     implementation 'net.fabricmc:javapoet:0.1.0'
     implementation 'net.fabricmc:mapping-io:0.4.0'
 
-    implementation 'org.ow2.asm:asm:9.2'
-    implementation 'org.ow2.asm:asm-analysis:9.2'
-    implementation 'org.ow2.asm:asm-commons:9.2'
-    implementation 'org.ow2.asm:asm-tree:9.2'
-    implementation 'org.ow2.asm:asm-util:9.2'
+    implementation 'org.ow2.asm:asm:9.7'
+    implementation 'org.ow2.asm:asm-analysis:9.7'
+    implementation 'org.ow2.asm:asm-commons:9.7'
+    implementation 'org.ow2.asm:asm-tree:9.7'
+    implementation 'org.ow2.asm:asm-util:9.7'
 
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.1'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.1'
diff --git a/src/main/java/net/fabricmc/mappingpoet/Main.java b/src/main/java/net/fabricmc/mappingpoet/Main.java
index 83c614b..62c9e12 100644
--- a/src/main/java/net/fabricmc/mappingpoet/Main.java
+++ b/src/main/java/net/fabricmc/mappingpoet/Main.java
@@ -194,7 +194,7 @@ public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IO
 
 							try (InputStream is = jarFile.getInputStream(entry)) {
 								ClassReader reader = new ClassReader(is);
-								reader.accept(new ClassVisitor(Opcodes.ASM8) {
+								reader.accept(new ClassVisitor(Opcodes.ASM9) {
 									@Override
 									public void visitInnerClass(String name, String outerName, String simpleName, int access) {
 										instanceInnerClasses.put(name, new Environment.NestedClassInfo(outerName, !Modifier.isStatic(access), simpleName));
diff --git a/src/main/java/net/fabricmc/mappingpoet/signature/PoetClassMethodSignatureVisitor.java b/src/main/java/net/fabricmc/mappingpoet/signature/PoetClassMethodSignatureVisitor.java
index eec5be7..a65c6ae 100644
--- a/src/main/java/net/fabricmc/mappingpoet/signature/PoetClassMethodSignatureVisitor.java
+++ b/src/main/java/net/fabricmc/mappingpoet/signature/PoetClassMethodSignatureVisitor.java
@@ -46,7 +46,7 @@ public final class PoetClassMethodSignatureVisitor extends SignatureVisitor {
 	TypeName returnType;
 
 	public PoetClassMethodSignatureVisitor(TypeAnnotationMapping mapping, ClassStaticContext context, boolean forClass) {
-		super(Opcodes.ASM8);
+		super(Opcodes.ASM9);
 		this.mapping = mapping;
 		this.context = context;
 		this.forClass = forClass;
diff --git a/src/main/java/net/fabricmc/mappingpoet/signature/PoetTypeSignatureWriter.java b/src/main/java/net/fabricmc/mappingpoet/signature/PoetTypeSignatureWriter.java
index ab8bff2..c4e920b 100644
--- a/src/main/java/net/fabricmc/mappingpoet/signature/PoetTypeSignatureWriter.java
+++ b/src/main/java/net/fabricmc/mappingpoet/signature/PoetTypeSignatureWriter.java
@@ -54,7 +54,7 @@ public final class PoetTypeSignatureWriter extends SignatureVisitor {
 	private PoetTypeSignatureWriter activeTypeArgument;
 
 	public PoetTypeSignatureWriter(TypeAnnotationBank storage, ClassStaticContext context) {
-		super(Opcodes.ASM8);
+		super(Opcodes.ASM9);
 		this.storage = storage;
 		this.context = context;
 	}