diff --git a/PyTorch/Segmentation/nnUNet/nnunet_for_pytorch_21.11.0.def b/PyTorch/Segmentation/nnUNet/nnunet_for_pytorch_21.11.0.def
index abaedb402d4590879b54581058b0efb8d18e13a5..ddb60ce6165ca12c9031bd40851a8d6da4a6bf0a 100644
--- a/PyTorch/Segmentation/nnUNet/nnunet_for_pytorch_21.11.0.def
+++ b/PyTorch/Segmentation/nnUNet/nnunet_for_pytorch_21.11.0.def
@@ -16,7 +16,7 @@ cd /workspace/nnunet_pyt
 wget --content-disposition https://api.ngc.nvidia.com/v2/resources/nvidia/nnunet_for_pytorch/versions/$VERSION/zip -O nnunet_for_pytorch_$VERSION.zip
 unzip nnunet_for_pytorch_21.11.0.zip
 
-sed 's/pytorch-lightning==1.3.8/pytorch-lightning==1.6.0/g' requirements.txt > temp_file && mv temp_file requirements.txt
+sed 's/pytorch-lightning==1.3.8/pytorch-lightning==1.5.10/g' requirements.txt > temp_file && mv temp_file requirements.txt
 pip install --disable-pip-version-check -r requirements.txt
 pip install monai==0.8.0 --no-dependencies
 pip uninstall -y torchtext