diff --git a/definition-files/ubuntu/Singularity.ubuntu-18.04-cuda-10.2 b/definition-files/ubuntu/Singularity.ubuntu-18.04-cuda-10.2
index 1483e02cbd238836884427ad637fa8f9a0c60381..ecb907a07b9ac8c1242af5ddecbe35a8065a2ba9 100644
--- a/definition-files/ubuntu/Singularity.ubuntu-18.04-cuda-10.2
+++ b/definition-files/ubuntu/Singularity.ubuntu-18.04-cuda-10.2
@@ -1,5 +1,5 @@
-Bootstrap: shub
-From: mkandes/naked-singularity:ubuntu-18.04
+Bootstrap: oras
+From: ghcr.io/mkandes/naked-singularity:ubuntu-18.04
 
 %labels
 
@@ -10,19 +10,12 @@ From: mkandes/naked-singularity:ubuntu-18.04
     AUTHOR_NAME Marty Kandes
     AUTHOR_EMAIL mkandes@sdsc.edu
 
-    LAST_UPDATED 20210427
+    LAST_UPDATED 20210903
 
 %setup
 
 %environment
 
-    # Location of NVIDIA/CUDA repositories
-    export CUDA_ROOT_URL='http://developer.download.nvidia.com/compute'
-    export CUDA_DISTRO='ubuntu1804'
-    export CUDA_ARCH='x86_64'
-    export CUDA_REPO_URL="${CUDA_ROOT_URL}/cuda/repos/${CUDA_DISTRO}/${CUDA_ARCH}"
-    export CUDA_GPG_PUBKEY='7fa2af80.pub'
-
     # Set NVIDIA driver and CUDA versions
     export CUDA_DRIVER_VERSION='460'
     export CUDA_MAJOR='10'
@@ -30,7 +23,7 @@ From: mkandes/naked-singularity:ubuntu-18.04
     export CUDA_VERSION="${CUDA_MAJOR}.${CUDA_MINOR}"
     export CUDNN_MAJOR='8'
     export CUDNN_MINOR='1'
-    export CUDNN_REVISION='0.77'
+    export CUDNN_REVISION='1.33'
     export CUDNN_VERSION="${CUDNN_MAJOR}.${CUDNN_MINOR}.${CUDNN_REVISION}"
     export NCCL_MAJOR='2'
     export NCCL_MINOR='8'
@@ -73,7 +66,7 @@ From: mkandes/naked-singularity:ubuntu-18.04
     export CUDA_VERSION="${CUDA_MAJOR}.${CUDA_MINOR}"
     export CUDNN_MAJOR='8'
     export CUDNN_MINOR='1'
-    export CUDNN_REVISION='0.77'
+    export CUDNN_REVISION='1.33'
     export CUDNN_VERSION="${CUDNN_MAJOR}.${CUDNN_MINOR}.${CUDNN_REVISION}"
     export NCCL_MAJOR='2'
     export NCCL_MINOR='8'
@@ -126,11 +119,6 @@ From: mkandes/naked-singularity:ubuntu-18.04
     apt-get -y libglu1-mesa
     apt-get -y libglu1-mesa-dev
 
-    # Set paths to CUDA binaries and libraries
-    export CUDA_HOME="/usr/local/cuda-${CUDA_VERSION}"
-    export PATH="${CUDA_HOME}/bin${PATH:+:${PATH}}"
-    export LD_LIBRARY_PATH="${CUDA_HOME}/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"
-
     # Cleanup
     apt-get -y autoremove --purge
     apt-get -y clean
diff --git a/definition-files/ubuntu/Singularity.ubuntu-18.04-cuda-11.2 b/definition-files/ubuntu/Singularity.ubuntu-18.04-cuda-11.2
index 8dac398ec5e8f359304bd1b2081416d4c2d6f4be..521d581ed57adcfb6713e37f57e7feedf438219b 100644
--- a/definition-files/ubuntu/Singularity.ubuntu-18.04-cuda-11.2
+++ b/definition-files/ubuntu/Singularity.ubuntu-18.04-cuda-11.2
@@ -23,7 +23,7 @@ From: ghcr.io/mkandes/naked-singularity:ubuntu-18.04
     export CUDA_VERSION="${CUDA_MAJOR}.${CUDA_MINOR}"
     export CUDNN_MAJOR='8'
     export CUDNN_MINOR='1'
-    export CUDNN_REVISION='0.77'
+    export CUDNN_REVISION='1.33'
     export CUDNN_VERSION="${CUDNN_MAJOR}.${CUDNN_MINOR}.${CUDNN_REVISION}"
     export NCCL_MAJOR='2'
     export NCCL_MINOR='8'