diff --git a/deploy/Dockerfile-spark-master b/deploy/Dockerfile-spark-master
index d636a4a..13cfd37 100644
--- a/deploy/Dockerfile-spark-master
+++ b/deploy/Dockerfile-spark-master
@@ -8,7 +8,7 @@ ENV SPARK_MASTER_PORT=7077
 ENV SPARK_MASTER_WEBUI_PORT=8080
 ENV SPARK_MASTER_HOST=spark-master
 
-ENV SPARK_WORKER_CORES=2
+ENV SPARK_WORKER_CORES=1
 ENV SPARK_WORKER_MEMORY=1g
 
 EXPOSE 7077 8080