diff --git a/src/main/java/BiGpairSEQ.java b/src/main/java/BiGpairSEQ.java
index 360e1f5..cdde624 100644
--- a/src/main/java/BiGpairSEQ.java
+++ b/src/main/java/BiGpairSEQ.java
@@ -16,7 +16,7 @@ public class BiGpairSEQ {
     private static HeapType priorityQueueHeapType = HeapType.FIBONACCI;
     private static boolean outputBinary = true;
     private static boolean outputGraphML = false;
-    private static final String version = "version 3.0";
+    private static final String version = "version 4.1";
 
     public static void main(String[] args) {
         if (args.length == 0) {