diff --git a/research/research.py b/research/research.py
index e3a68e0..3d27fb6 100644
--- a/research/research.py
+++ b/research/research.py
@@ -242,7 +242,9 @@ def build_categorical_features_encoder_target(*, random_state=None):
 # %%
 def build_regressor(*, random_state=None):
     return sklearn.ensemble.RandomForestRegressor(
-        10, criterion='squared_error', max_features='sqrt', random_state=random_state,
+        10, criterion='squared_error',
+        max_depth=8, max_features='sqrt',
+        random_state=random_state,
     )