diff --git a/hiyapyco/__init__.py b/hiyapyco/__init__.py
index 4e3b350..ccadcdb 100644
--- a/hiyapyco/__init__.py
+++ b/hiyapyco/__init__.py
@@ -25,7 +25,7 @@
 import io
 import copy
 import yaml
-from jinja2 import Environment, Undefined, TemplateError
+from jinja2 import Environment, Undefined, DebugUndefined, StrictUndefined, TemplateError
 
 from . import odyldo