diff --git a/setup.py b/setup.py
index 5a3f6ad..d2a470f 100644
--- a/setup.py
+++ b/setup.py
@@ -35,7 +35,7 @@ with open(path.join(here, 'versiondep.txt'), encoding='utf-8') as f:
         modversion[l2[0]] = {'min': l2[1], 'max': l2[2], 'prefix': l2[3]}
 
 # tryton-version
-major_version = 6
+major_version = 5
 minor_version = 0
 
 requires = ['python-slugify', 'pypdf', 'factur-x']
@@ -83,6 +83,8 @@ setup(
         'Natural Language :: English',
         'Operating System :: OS Independent',
         'License :: OSI Approved :: GNU General Public License (GPL)',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
diff --git a/versiondep.txt b/versiondep.txt
index aa3485b..f36dc31 100644
--- a/versiondep.txt
+++ b/versiondep.txt
@@ -1,2 +1,2 @@
 edocument_xrechnung;5.0.9;5.0.999;mds
-tryton6_backport;5.0.3;5.0.999:mds
+tryton6_backport;5.0.3;5.0.999;mds