diff --git a/requirements.txt b/requirements.txt
index 626528b4..2abe5093 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,30 +1,31 @@
 # Add here external Python modules dependencies, one per line. Module names
 # should match https://pypi.python.org/pypi names. For the full spec or
 # dependency lines, see https://pip.readthedocs.org/en/1.1/requirements.html
 
 # Runtime dependencies
 beautifulsoup4
 Django >= 1.11.0, < 2.0
 django-cors-headers
 djangorestframework >= 3.4.0
 django_webpack_loader
 django_js_reverse
 docutils
 python-magic >= 0.4.0
 htmlmin
 lxml
 prometheus_client
 pygments
 pypandoc
 python-dateutil
 pyyaml
 requests
 python-memcached
 pybadges
 sentry-sdk
+typing-extensions
 
 # Doc dependencies
 sphinx
 sphinxcontrib-httpdomain