diff --git a/.build/Dockerfile b/.build/Dockerfile
old mode 100644
new mode 100755
index 0328c86..c007c06
--- a/.build/Dockerfile
+++ b/.build/Dockerfile
@@ -1,6 +1,6 @@
 # Use NVIDIA CUDA as base image and run the same installation as in the other packages.
 # The version of cudatoolkit must match those of the base image, see Dockerfile.pytorch
-FROM nvidia/cuda:10.2-base-ubuntu18.04
+FROM nvidia/cuda:10.1-base-ubuntu18.04
 LABEL maintainer="Jupyter Project <jupyter@googlegroups.com>"
 
 ############################################################################
@@ -380,7 +380,7 @@ RUN conda install --quiet --yes \
 
 # Install PyTorch, version of cudatoolkit must match those of the base image
 RUN conda install -y -c pytorch \
-    cudatoolkit=10.2 \
+    cudatoolkit=10.1 \
     'pytorch=1.3.1' \
     torchvision && \
     conda clean --all -f -y && \
diff --git a/.build/fix-permissions b/.build/fix-permissions
old mode 100644
new mode 100755
diff --git a/.build/jupyter_notebook_config.json b/.build/jupyter_notebook_config.json
old mode 100644
new mode 100755
diff --git a/.build/jupyter_notebook_config.py b/.build/jupyter_notebook_config.py
old mode 100644
new mode 100755
diff --git a/generate_Dockerfile.sh b/generate_Dockerfile.sh
index 8c36384..2ced685 100755
--- a/generate_Dockerfile.sh
+++ b/generate_Dockerfile.sh
@@ -29,7 +29,7 @@ cp $STACKS_DIR/base-notebook/fix-permissions .build/
 cp $STACKS_DIR/base-notebook/start.sh .build/
 cp $STACKS_DIR/base-notebook/start-notebook.sh .build/
 cp $STACKS_DIR/base-notebook/start-singleuser.sh .build/
-chmod 755 .build/*.sh
+chmod 755 .build/*
 
 echo "
 ############################################################################
diff --git a/src/Dockerfile.header b/src/Dockerfile.header
index 1a5d9ba..60fe719 100644
--- a/src/Dockerfile.header
+++ b/src/Dockerfile.header
@@ -1,4 +1,4 @@
 # Use NVIDIA CUDA as base image and run the same installation as in the other packages.
 # The version of cudatoolkit must match those of the base image, see Dockerfile.pytorch
-FROM nvidia/cuda:10.2-base-ubuntu18.04
+FROM nvidia/cuda:10.1-base-ubuntu18.04
 LABEL maintainer="Jupyter Project <jupyter@googlegroups.com>"
diff --git a/src/Dockerfile.pytorch b/src/Dockerfile.pytorch
index f3eec75..ad344ed 100644
--- a/src/Dockerfile.pytorch
+++ b/src/Dockerfile.pytorch
@@ -7,7 +7,7 @@ RUN conda install --quiet --yes \
 
 # Install PyTorch, version of cudatoolkit must match those of the base image
 RUN conda install -y -c pytorch \
-    cudatoolkit=10.2 \
+    cudatoolkit=10.1 \
     'pytorch=1.3.1' \
     torchvision && \
     conda clean --all -f -y && \