diff --git a/testdata/requirements.txt b/testdata/requirements.txt
index 7a9b3ee..5cf355d 100644
--- a/testdata/requirements.txt
+++ b/testdata/requirements.txt
@@ -1,5 +1,5 @@
 xgboost==1.7.6
 scikit-learn==1.4.2
-treelite==3.9.1
+treelite==4.2.1
 treelite-runtime==3.9.1
 pandas==2.2.2