diff --git a/requirements.txt b/requirements.txt
index 4e97f48cb233b52f5f9af2d783cbd472549c450d..a2f2947eb39ae44aeb79b476503995bde6c73081 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,6 +41,7 @@ python-dateutil==2.6.0
 python-editor==1.0.3
 python-engineio==1.2.2
 python-Levenshtein==0.12.0
+python-pam==1.8.2
 python-socketio==1.7.1
 pytz==2016.10
 PyYAML==3.12