diff --git a/asm-util/src/main/java/org/objectweb/asm/util/ASMifier.java b/asm-util/src/main/java/org/objectweb/asm/util/ASMifier.java
index 51134811c6798a735c4bcf544288736d38e52616..2d1966a5e2bc9368466707c8b92149d81c07d312 100644
--- a/asm-util/src/main/java/org/objectweb/asm/util/ASMifier.java
+++ b/asm-util/src/main/java/org/objectweb/asm/util/ASMifier.java
@@ -109,6 +109,7 @@ public class ASMifier extends Printer {
     classVersions.put(Opcodes.V17, "V17");
     classVersions.put(Opcodes.V18, "V18");
     classVersions.put(Opcodes.V19, "V19");
+    classVersions.put(Opcodes.V20, "V20");
     CLASS_VERSIONS = Collections.unmodifiableMap(classVersions);
   }
 
diff --git a/asm/src/main/java/org/objectweb/asm/ClassReader.java b/asm/src/main/java/org/objectweb/asm/ClassReader.java
index 413f2a1a323a760813f619eb4ae6c46357c4ca14..2a1139c3243a5b68b5617d2ffd88f214c2720956 100644
--- a/asm/src/main/java/org/objectweb/asm/ClassReader.java
+++ b/asm/src/main/java/org/objectweb/asm/ClassReader.java
@@ -194,7 +194,7 @@ public class ClassReader {
     this.b = classFileBuffer;
     // Check the class' major_version. This field is after the magic and minor_version fields, which
     // use 4 and 2 bytes respectively.
-    if (checkClassVersion && readShort(classFileOffset + 6) > Opcodes.V19) {
+    if (checkClassVersion && readShort(classFileOffset + 6) > Opcodes.V20) {
       throw new IllegalArgumentException(
           "Unsupported class file major version " + readShort(classFileOffset + 6));
     }
diff --git a/asm/src/main/java/org/objectweb/asm/Opcodes.java b/asm/src/main/java/org/objectweb/asm/Opcodes.java
index c4d1679a62c28b5eb83db73eff83d4e85c75de54..4a85a445e1a00191919e9ca587ca13f685430a0c 100644
--- a/asm/src/main/java/org/objectweb/asm/Opcodes.java
+++ b/asm/src/main/java/org/objectweb/asm/Opcodes.java
@@ -285,6 +285,7 @@ public interface Opcodes {
   int V17 = 0 << 16 | 61;
   int V18 = 0 << 16 | 62;
   int V19 = 0 << 16 | 63;
+  int V20 = 0 << 16 | 64;
 
   /**
    * Version flag indicating that the class is using 'preview' features.
diff --git a/asm/src/test/java/org/objectweb/asm/ConstantsTest.java b/asm/src/test/java/org/objectweb/asm/ConstantsTest.java
index 8c2208618d86e0ffceb2be09053c2c5fb3878b08..f2ca92a2fddb8c5a488b393fdb533d2f599c787b 100644
--- a/asm/src/test/java/org/objectweb/asm/ConstantsTest.java
+++ b/asm/src/test/java/org/objectweb/asm/ConstantsTest.java
@@ -252,6 +252,7 @@ class ConstantsTest {
       case "V17":
       case "V18":
       case "V19":
+      case "V20":
         return ConstantType.CLASS_VERSION;
       case "ACC_PUBLIC":
       case "ACC_PRIVATE":