diff --git a/docker/Dockerfile-data b/docker/Dockerfile-data
index d86fa9f..aa83552 100644
--- a/docker/Dockerfile-data
+++ b/docker/Dockerfile-data
@@ -1,6 +1,8 @@
 
 FROM eclipse-temurin:21-jre-alpine
 
+RUN apk add --no-cache --upgrade bash
+
 COPY . /POEM
 WORKDIR /POEM/rcads
 
diff --git a/rcads/generate.sh b/rcads/generate.sh
index e13f495..2dccc2f 100755
--- a/rcads/generate.sh
+++ b/rcads/generate.sh
@@ -1,4 +1,4 @@
-#!/bin/ash
+#!/bin/sh
 
 echo "Generating RDF files from RML mappings..."
 echo "Instruments..."