diff --git a/tests/test_sklearn.py b/tests/test_sklearn.py
index c384125..3dd11da 100644
--- a/tests/test_sklearn.py
+++ b/tests/test_sklearn.py
@@ -18,6 +18,7 @@
 from sklearn.model_selection import train_test_split
 
 # from sklearn.utils.estimator_checks import check_estimator
+from sklearn.utils.estimator_checks import check_estimators_pickle
 from sklearn.utils.estimator_checks import check_set_params
 
 from optgbm.sklearn import OGBMClassifier
@@ -48,6 +49,7 @@ def test_ogbm_classifier() -> None:
 
     # check_estimator(clf)
 
+    check_estimators_pickle(name, clf)
     check_set_params(name, clf)
 
 
@@ -57,6 +59,7 @@ def test_ogbm_regressor() -> None:
 
     # check_estimator(reg)
 
+    check_estimators_pickle(name, reg)
     check_set_params(name, reg)