diff --git a/docs/book/src/installation/upgrade.rst b/docs/book/src/installation/upgrade.rst
index 282dceee29..6f2901db60 100644
--- a/docs/book/src/installation/upgrade.rst
+++ b/docs/book/src/installation/upgrade.rst
@@ -58,9 +58,10 @@ The following steps are suggested as requirement to migrate your data:
    your virtual machines.
 6. Copy from your backup "storage" and "db" folders.
 
-Now setup Alembic (the framework used for migrations) with::
+Now setup Alembic (the framework used for migrations) and dateutil with::
 
     pip install alembic
+    pip install python-dateutil
 
 Enter the alembic migration directory in "utils/db_migration" with::