diff --git a/pitest/src/main/java/org/pitest/bytecode/ASMVersion.java b/pitest/src/main/java/org/pitest/bytecode/ASMVersion.java
index 0a1f376d3..971e18dae 100644
--- a/pitest/src/main/java/org/pitest/bytecode/ASMVersion.java
+++ b/pitest/src/main/java/org/pitest/bytecode/ASMVersion.java
@@ -3,5 +3,5 @@
 import org.objectweb.asm.Opcodes;
 
 public class ASMVersion {
-  public static final int ASM_VERSION = Opcodes.ASM8;
+  public static final int ASM_VERSION = Opcodes.ASM9;
 }
diff --git a/pom.xml b/pom.xml
index c696a257f..a102dd7a6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -389,7 +389,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-		<asm.version>8.0</asm.version>
+		<asm.version>9.1</asm.version>
 		<ant.version>1.9.4</ant.version>
 		<hamcrest.version>1.3</hamcrest.version>
 		<junit.version>4.11</junit.version>