diff --git a/Dockerfile b/Dockerfile
index acec911..8200b1e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -36,7 +36,7 @@ RUN \
     echo "deb http://ftp.debian.org/debian jessie-backports main" | tee /etc/apt/sources.list.d/openjdk-8-jdk.list && \
     apt-get update && \
     echo "===> install Java" && \
-    apt-get install -yq --no-install-recommends --fix-missing openjdk-8-jdk 
+    apt install -t jessie-backports -yq --no-install-recommends --fix-missing openjdk-8-jre-headless ca-certificates-java
 
 
 # define default command
@@ -218,11 +218,16 @@ COPY misc-modules/* $CONDA_DIR/lib/python2.7/site-packages/
 RUN jupyter serverextension enable sparktk_ext
 
 
-# Install remaining tk packages
+# Install remaining tk packages and enable jupyter-spark extension
 RUN \
     pip install trustedanalytics \
     tabulate==0.7.5 \
-    snakebite==2.11.0 
+    snakebite==2.11.0 \
+    jupyter-spark && \
+    jupyter serverextension enable --py jupyter_spark && \
+    jupyter nbextension install --py jupyter_spark && \
+    jupyter nbextension enable --py jupyter_spark && \
+    jupyter nbextension enable --py widgetsnbextension
 
 
 # Final cleanup