diff --git a/HISTORY.md b/HISTORY.md
index 831218d..184fa24 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,9 @@
-0.4.27
+0.4.28
 
 * fix random order in Variant field [#84](https://github.com/miRTop/mirtop/issues/83)
+
+0.4.27
+
 * fix possible duplication of lines [#80](https://github.com/miRTop/mirtop/issues/80)
 * accept prefix for gff output [#84](https://github.com/miRTop/mirtop/issues/84)
 
diff --git a/mirtop/mirna/realign.py b/mirtop/mirna/realign.py
index f2bad95..f5b4e5e 100644
--- a/mirtop/mirna/realign.py
+++ b/mirtop/mirna/realign.py
@@ -94,7 +94,7 @@ def formatGFF(self):
             value.append("iso_3p:%s%s" % (direction, size))
         if not value:
             value = ["NA"]
-        return ",".join(list(set(value)))
+        return ",".join(sorted(list(set(value))))
 
     def format(self, sep="\t"):
         """Create tabular line from variant fields."""
diff --git a/setup.py b/setup.py
index ed944fb..6fbda8c 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 import os
 from setuptools import setup, find_packages
 
-version = '0.4.27'
+version = '0.4.28'
 url = 'http://github.com/mirtop/mirtop'