diff --git a/rastervision_pytorch_learner/requirements.txt b/rastervision_pytorch_learner/requirements.txt
index 7f417ca88..0a1cfac4a 100644
--- a/rastervision_pytorch_learner/requirements.txt
+++ b/rastervision_pytorch_learner/requirements.txt
@@ -6,7 +6,7 @@ torch==2.1.2
 torchvision==0.16.2
 tensorboard==2.15.1
 albumentations==1.3.1
-cython==0.29.35
+cython==3.0.8
 pycocotools==2.0.7
 psutil==5.9.3
 opencv-python-headless==4.9.0.80