diff --git a/requirements-docs.in b/requirements-docs.in
index 9dee5474..b6c8d2f4 100644
--- a/requirements-docs.in
+++ b/requirements-docs.in
@@ -17,6 +17,7 @@ Flask-SQLAlchemy
 flask_replicated
 inflection
 logmatic-python
+pem
 raven[flask]
 SQLAlchemy-Utils
 
diff --git a/requirements-docs.txt b/requirements-docs.txt
index 9fdaeb63..7d99dd51 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -52,6 +52,8 @@ markupsafe==1.1.1
     # via jinja2
 packaging==20.3
     # via sphinx
+pem==21.1.0
+    # manual debug
 pygments==2.6.1
     # via sphinx
 pyparsing==2.4.7