diff --git a/requirements.in b/requirements.in
index 55881d393d216e533accde3ea4fc53352bef6c8f..d65319405eb2847fa57fdca0e7502bef1c50fe3f 100644
--- a/requirements.in
+++ b/requirements.in
@@ -1,6 +1,7 @@
 # Ansible and role runtime.
 ansible~=10.3
 netaddr
+passlib
 python-ldap
 
 # Development and testing.