diff --git a/docker-compose/README.md b/docker-compose/README.md
index f06f6ea6..33bd0379 100644
--- a/docker-compose/README.md
+++ b/docker-compose/README.md
@@ -20,6 +20,13 @@ Open <http://localhost:8084/> to view the cluster's topics.
 docker compose -f compose.decompose-xmls.yaml up
 ```
 
+## Convert the FHIR resources to a CSV dataset
+
+```sh
+sudo chown -R 1001:1001 ./opal-output/
+docker compose -f compose.adtfhir-to-opal.yaml up
+```
+
 ## Start the entire stack
 
 ```sh
diff --git a/docker-compose/compose.adtfhir-to-opal.yaml b/docker-compose/compose.adtfhir-to-opal.yaml
index a407d468..89b9e2f0 100644
--- a/docker-compose/compose.adtfhir-to-opal.yaml
+++ b/docker-compose/compose.adtfhir-to-opal.yaml
@@ -8,9 +8,9 @@ services:
     ipc: private
     security_opt:
       - "no-new-privileges:true"
-    user: "1000:100"
+    user: "1001:1001"
     environment:
-      OUTPUT_FOLDER: "/home/jovyan/opal-output"
+      OUTPUT_FOLDER: "/opt/bitnami/spark/opal-output"
       KAFKA_TOPIC_YEAR_SUFFIX: "" # e.g. ".2023"
       KAFKA_BOOTSTRAP_SERVER: "kafka:9092"
       KAFKA_PATIENT_TOPIC: "fhir.onkoadt.Patient"
@@ -19,4 +19,4 @@ services:
       KAFKA_PROCEDURE_TOPIC: "fhir.onkoadt.Procedure"
       KAFKA_MEDICATIONSTATEMENT_TOPIC: "fhir.onkoadt.MedicationStatement"
     volumes:
-      - ${PWD}/opal-output:/home/jovyan/opal-output
+      - ${PWD}/opal-output:/opt/bitnami/spark/opal-output
diff --git a/src/adtfhir_to_opal/Dockerfile b/src/adtfhir_to_opal/Dockerfile
index fb3d7fc4..09316325 100644
--- a/src/adtfhir_to_opal/Dockerfile
+++ b/src/adtfhir_to_opal/Dockerfile
@@ -1,13 +1,17 @@
-FROM docker.io/jupyter/pyspark-notebook:spark-3.3.2@sha256:86f23b36bbd1900e10ce15bb29cf55ce31b10b1406c5afa6e57acf529cb10093
-WORKDIR /home/jovyan
-USER 1000:100
+FROM docker.io/bitnami/spark:3.3.2@sha256:11ccd03367cadc0da48432e7636746e98a842324f590630f6d14299a40ff2ee4
+ENV SPARK_JARS_IVY="/home/spark/.ivy"
+WORKDIR /opt/bitnami/spark
+USER 0
+RUN groupadd -g 1001 spark && \
+    useradd spark -u 1001 -g spark -m -s /bin/bash
 
 COPY requirements.txt requirements.txt
 
-RUN <<EOF
-pip install --no-cache-dir -r requirements.txt
-spark-shell -v --packages "org.apache.spark:spark-sql-kafka-0-10_2.12:3.3.2,au.csiro.pathling:library-api:6.2.1,ch.cern.sparkmeasure:spark-measure_2.13:0.21,io.delta:delta-core_2.12:2.3.0"
-EOF
+RUN pip install --no-cache-dir -r requirements.txt
+
+USER 1001:1001
+RUN spark-shell -v --conf spark.jars.ivy=${SPARK_JARS_IVY}\
+    --packages "org.apache.spark:spark-sql-kafka-0-10_2.12:3.3.2,au.csiro.pathling:library-api:6.2.1,ch.cern.sparkmeasure:spark-measure_2.13:0.21,io.delta:delta-core_2.12:2.3.0"
 
 COPY adtfhir_to_opal.py adtfhir_to_opal.py
 
diff --git a/src/adtfhir_to_opal/adtfhir_to_opal.py b/src/adtfhir_to_opal/adtfhir_to_opal.py
index 051c756d..5216b1e0 100644
--- a/src/adtfhir_to_opal/adtfhir_to_opal.py
+++ b/src/adtfhir_to_opal/adtfhir_to_opal.py
@@ -20,6 +20,7 @@ class Settings(BaseSettings):
     kafka_observation_topic: str = "fhir.onkoadt.Observation"
     kafka_procedure_topic: str = "fhir.onkoadt.Procedure"
     kafka_medicationstatement_topic: str = "fhir.onkoadt.MedicationStatement"
+    # ⚠️ make sure these are consistent with the ones downloaded inside the Dockerfile
     jar_list: list = [
         "org.apache.spark:spark-sql-kafka-0-10_2.12:3.3.2",
         "au.csiro.pathling:library-api:6.2.1",
@@ -35,6 +36,8 @@ class Settings(BaseSettings):
     spark_driver_memory: str = "8g"
     spark_executor_cores: str = "4"
 
+    spark_jars_ivy: str = "/home/spark/.ivy2"
+
 
 settings = Settings()
 
@@ -51,7 +54,7 @@ def setup_spark_session(appName: str, master: str):
         .config("spark.executor.cores", settings.spark_executor_cores)
         .config("spark.sql.extensions", "io.delta.sql.DeltaSparkSessionExtension")
         .config("spark.jars.packages", ",".join(settings.jar_list))
-        .config("spark.jars.ivy", "/home/jovyan/.ivy2")
+        .config("spark.jars.ivy", settings.spark_jars_ivy)
         .config(
             "spark.sql.catalog.spark_catalog",
             "org.apache.spark.sql.delta.catalog.DeltaCatalog",
diff --git a/src/adtfhir_to_opal/compose.yaml b/src/adtfhir_to_opal/compose.yaml
index ae761f40..0819800c 100644
--- a/src/adtfhir_to_opal/compose.yaml
+++ b/src/adtfhir_to_opal/compose.yaml
@@ -4,8 +4,8 @@ services:
       context: .
       dockerfile: Dockerfile
     environment:
-      OUTPUT_FOLDER: "/home/jovyan/opal-output"
-      KAFKA_TOPIC_YEAR_SUFFIX: ".2023"
+      OUTPUT_FOLDER: "/opt/bitnami/spark/opal-output"
+      KAFKA_TOPIC_YEAR_SUFFIX: ""
       KAFKA_BOOTSTRAP_SERVER: "kafka:9092"
       KAFKA_PATIENT_TOPIC: "fhir.onkoadt.Patient"
       KAFKA_CONDITION_TOPIC: "fhir.onkoadt.Condition"
@@ -13,4 +13,4 @@ services:
       KAFKA_PROCEDURE_TOPIC: "fhir.onkoadt.Procedure"
       KAFKA_MEDICATIONSTATEMENT_TOPIC: "fhir.onkoadt.MedicationStatement"
     volumes:
-      - ${PWD}/output:/home/jovyan/opal-output
+      - ${PWD}/output:/opt/bitnami/spark/opal-output
diff --git a/src/adtfhir_to_opal/requirements.txt b/src/adtfhir_to_opal/requirements.txt
index ac49d454..58c1e0e9 100644
--- a/src/adtfhir_to_opal/requirements.txt
+++ b/src/adtfhir_to_opal/requirements.txt
@@ -1,3 +1,4 @@
 pathling==6.2.1
 pydantic==1.10.9
 pyspark==3.3.2
+pandas==2.1.0