diff --git a/setup.cfg b/setup.cfg
index a765892..31f5b44 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,7 +3,7 @@
 packages=
     ordinalgbt
 install_requires=
-    lightgbm
+    lightgbm<4
     numpy
     scipy
     scikit-learn