diff --git a/pom.xml b/pom.xml
index 53bc76e..0aa01ce 100644
--- a/pom.xml
+++ b/pom.xml
@@ -45,7 +45,7 @@
         <dependency>
             <groupId>org.ow2.asm</groupId>
             <artifactId>asm-commons</artifactId>
-            <version>8.0.1</version>
+            <version>9.1</version>
             <scope>compile</scope>
         </dependency>
         <dependency>
diff --git a/src/main/java/net/md_5/specialsource/JarComparer.java b/src/main/java/net/md_5/specialsource/JarComparer.java
index 345ec02..82107a0 100644
--- a/src/main/java/net/md_5/specialsource/JarComparer.java
+++ b/src/main/java/net/md_5/specialsource/JarComparer.java
@@ -71,7 +71,7 @@ public class JarComparer extends ClassVisitor {
     }
 
     public JarComparer(Jar jar) {
-        super(Opcodes.ASM8);
+        super(Opcodes.ASM9);
         this.jar = jar;
         this.jarRepo = new JarRepo(jar);
         this.inheritance = new JarProvider(jar);
@@ -166,7 +166,7 @@ public class JarComparer extends ClassVisitor {
     private class MethodReferenceFinder extends MethodVisitor {
 
         public MethodReferenceFinder() {
-            super(Opcodes.ASM8);
+            super(Opcodes.ASM9);
         }
 
         @Override