diff --git a/helpers/DATA/python-apt/patch_changes/pep440.patch b/helpers/DATA/python-apt/patch_changes/pep440.patch
new file mode 100644
index 0000000..ac50a64
--- /dev/null
+++ b/helpers/DATA/python-apt/patch_changes/pep440.patch
@@ -0,0 +1,23 @@
+diff --git a/setup.py b/setup.py
+index 9648d871..a63a2c66 100644
+--- a/setup.py
++++ b/setup.py
+@@ -6,6 +6,7 @@ import os
+ import shutil
+ import subprocess
+ import sys
++import re
+ 
+ from setuptools import Extension, setup
+ from setuptools.command.install import install
+@@ -64,6 +64,10 @@ def get_version():
+     version = version.replace("tanglu", "+tanglu")
+     version = version.split("build")[0]
+ 
++    # Trisquel-style suffix: "3.1.0trisquel12" -> "3.1.0+trisquel12" (PEP 440 local)
++    if "+" not in version:
++        version = re.sub(r"(?<=\d)([A-Za-z])", r"+\1", version, count=1)
++
+     return version
+ 
+ 
diff --git a/helpers/make-python-apt b/helpers/make-python-apt
index 3f5924e..3e945b2 100644
--- a/helpers/make-python-apt
+++ b/helpers/make-python-apt
@@ -24,7 +24,7 @@
 # list available on the resulting netinstall (mini.iso) image.
 # The same way as 'ubiquity' is for for the next Live Desktop ISOs.
 
-VERSION=12
+VERSION=13
 EXTERNAL='deb-src http://archive.ubuntu.com/ubuntu resolute main'
 REPOKEY=871920D1991BC93C
 COMPONENT=main
@@ -89,9 +89,12 @@ diff -ru source.orig/apt/progress/base.py source/apt/progress/base.py
                  self.percent = float(percent)
 EOF
 
+apply_patch_changes
+
 export DEB_BUILD_OPTIONS=nocheck
 
-changelog "Compiled for Trisquel"
+changelog "Compiled for Trisquel
+Fixed PEP440 version issue."
 
 package