diff --git a/.gitignore b/.gitignore
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..7558683ea73a3cc3df6d73e6765ae2edb822737d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,3 @@
+examples/003_example/study_000/
+tree_maker.egg-info/
+tree_maker/__pycache__/
diff --git a/setup.py b/setup.py
index 8f70832a1bb4a1112db1c1e7f1f32fbfb72aaacd..381c737d7d8fae9d9c79e8b6221dab070c77230f 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@ with (HERE / "README.md").open("rt") as fh:
 
 
 REQUIREMENTS: dict = {
-    "core": ["anytree", "pyyaml", "ruamel.yaml", "pathlib", "pandas"],
+    "core": ["anytree", "pyyaml", "ruamel.yaml", "pathlib", "pandas","orjson"],
     "test": [
         "pytest",
     ],