diff --git a/CHANGES.md b/CHANGES.md
index 6169f5a..b51b2a3 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # CHANGES
 
+## 3.1.1
+
+* Fix regression - ability to cope with chromosomes with no events.
+
 ## 3.1.0
 
 * Incorporates updated pindel which improves sensitivity
diff --git a/perl/lib/Sanger/CGP/Pindel.pm b/perl/lib/Sanger/CGP/Pindel.pm
index b90e36d..664c4c0 100644
--- a/perl/lib/Sanger/CGP/Pindel.pm
+++ b/perl/lib/Sanger/CGP/Pindel.pm
@@ -26,7 +26,7 @@ use strict;
 use Const::Fast qw(const);
 
 use base 'Exporter';
-our $VERSION = '3.1.0';
+our $VERSION = '3.1.1';
 our @EXPORT = qw($VERSION);
 
 1;