diff --git a/src/soundevent/io/annotation_projects.py b/src/soundevent/io/annotation_projects.py
index 7391065..48fc180 100644
--- a/src/soundevent/io/annotation_projects.py
+++ b/src/soundevent/io/annotation_projects.py
@@ -122,7 +122,7 @@ def load_annotation_project_in_aoef_format(
     """Load annotation project from path in AOEF format."""
     path = Path(path)
     audio_dir = Path(audio_dir).resolve()
-    annotation_project_object = AnnotationProjectObject.validate_json(
+    annotation_project_object = AnnotationProjectObject.model_validate_json(
         path.read_text()
     )
     return annotation_project_object.to_annotation_project(audio_dir=audio_dir)
diff --git a/tox.ini b/tox.ini
index 5008ba0..792de29 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,11 +1,12 @@
 [tox]
 requires = tox>=4
-env_list = lint, type, py{37,38,39,310,311}
+env_list = lint, type, py{38,39,310,311}
 
 [testenv]
 description = run the tests with pytest
 deps =
     pytest>=6
+    hypothesis
 commands =
     pytest {tty:--color=yes} {posargs:tests}