diff --git a/constraints.txt b/constraints.txt
new file mode 100644
index 00000000..ba4246ae
--- /dev/null
+++ b/constraints.txt
@@ -0,0 +1,68 @@
+# Constraints on versions supported by Python 2.7 and Django 1.11
+# Vyrobeno 2021-04-21
+# Neručím za správnost, kdyžtak opravte :-P
+# Možná jednou pro něco bude existovat novější funkční verze, možno změnit…
+
+# Postup tvorby:
+# pip freeze > constraints.txt
+# projití PyPI a najití posledních verzí, které se tváří býti kompatibilní s Py2.7 a Dj1.11
+
+akismet<=1.0.1
+backports.functools-lru-cache<=1.6.4
+backports.shutil-get-terminal-size<=1.0.0
+certifi<=2020.4.5.1
+chardet<=4.0.0
+decorator<=4.4.2
+Django<1.12
+django-appconf<=1.0.3
+django-autocomplete-light<3
+django-ckeditor<=5.9.0
+django-classy-tags<=1.0.0
+django-contrib-comments<=1.9.2
+django-countries<=5.5
+django-crispy-forms<=1.8.1
+django-debug-toolbar<=1.11.1
+django-extensions<3
+django-fluent-comments<=2.1
+django-imagekit<=4.0.2
+django-js-asset<=1.2.2
+django-mptt<=0.9.1
+django-reversion<=3.0.4
+django-sekizai<=1.1.0
+
+# No data on PyPI nor homepage
+#django-solo==1.1.3
+#uWSGI==2.0.17.1
+
+django-tag-parser<=3.2
+django-taggit<=0.24.0
+django-threadedcomments<=1.2
+enum34<=1.1.10
+html5lib<=1.1
+idna<=2.10
+ipython<=5.10.0
+ipython-genutils<=0.2.0
+pathlib2<=2.3.5
+pexpect<=4.8.0
+pickleshare<=0.7.5
+pilkit<=2.0
+Pillow<=6.2.2
+prompt-toolkit<=2.0.10
+psycopg2<=2.8.6
+ptyprocess<=0.7.0
+Pygments<=2.5.2
+python-akismet<=0.4.2
+pytz<=2021.1
+requests<=2.25.1
+scandir<=1.10.0
+simplegeneric<=0.8.1
+six<=1.15.0
+sqlparse<=0.3.1
+traitlets<=4.3.3
+typing<=3.7.4.3
+Unidecode<=1.2.0
+urllib3<=1.26.4
+wcwidth<=0.2.5
+webencodings<=0.5.1
+Werkzeug<=1.0.1
+
diff --git a/requirements.txt b/requirements.txt
index 989f8380..c8f7c8a6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+-c constraints.txt
 # basic libs
 
 psycopg2==2.7.5