src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassFile.java

*** 114,124 ****
          V51(51, 0),   // JDK 1.7
          V52(52, 0),   // JDK 1.8: lambda, type annos, param names
          V53(53, 0),   // JDK 1.9: modules, indy string concat
          V54(54, 0),   // JDK 10
          V55(55, 0),   // JDK 11: constant dynamic, nest mates
!         V56(56, 0);   // JDK 12
          Version(int major, int minor) {
              this.major = major;
              this.minor = minor;
          }
          public final int major, minor;
--- 114,125 ----
          V51(51, 0),   // JDK 1.7
          V52(52, 0),   // JDK 1.8: lambda, type annos, param names
          V53(53, 0),   // JDK 1.9: modules, indy string concat
          V54(54, 0),   // JDK 10
          V55(55, 0),   // JDK 11: constant dynamic, nest mates
!         V56(56, 0),   // JDK 12
!         V57(57, 0);   // JDK 13
          Version(int major, int minor) {
              this.major = major;
              this.minor = minor;
          }
          public final int major, minor;