diff --git a/ci/Dockerfile b/ci/Dockerfile
index 69fdd3a..c2b8a41 100644
--- a/ci/Dockerfile
+++ b/ci/Dockerfile
@@ -8,6 +8,9 @@ USER root
 
 ENV QUARTO_CLI=https://github.com/quarto-dev/quarto-cli/releases/download/v1.3.433/quarto-1.3.433-linux-amd64.deb
 
+ENV VSCODE_EXT_DIR=/opt/code-server/extensions
+RUN mkdir -p ${VSCODE_EXT_DIR} && chown -R ${NB_USER}: ${VSCODE_EXT_DIR}
+    
 RUN wget -O /tmp/quarto.deb ${QUARTO_CLI} && dpkg -i /tmp/quarto.deb && rm -rf /tmp/quarto.deb && apt-get clean
 
 USER ${NB_USER}
@@ -16,8 +19,7 @@ WORKDIR ${HOME}/.kernels
 
 RUN chmod +x install-kernels.sh && cd /home/jovyan/.kernels && ./install-kernels.sh environments
 
-RUN mkdir -p /opt/code-server/extensions && \
-    echo "extensions-dir: /opt/code-server/extensions" >> $HOME/.config/code-server/config.yaml && \
+RUN echo "extensions-dir: $VSCODE_EXT_DIR" >> $HOME/.config/code-server/config.yaml && \
     EXT_LIST="ms-python.python quarto.quarto" && \
     for EXT in $EXT_LIST; do code-server --install-extension $EXT; done