diff --git a/opensearch-master/Dockerfile b/opensearch-master/Dockerfile
index 9ac58bf..0cd7373 100644
--- a/opensearch-master/Dockerfile
+++ b/opensearch-master/Dockerfile
@@ -1,10 +1,11 @@
 ARG BASE_IMAGE=opensearchproject/opensearch:latest
 FROM ${BASE_IMAGE}
 
-# Install dependencies for configuration
-RUN microdnf update -y && \
-    microdnf install -y gettext bash jq && \
-    microdnf clean all
+# Install dependencies for configuration (Ubuntu uses apt)
+RUN apt-get update -y && \
+    apt-get install -y gettext-base jq && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
 
 # Copy configuration files and scripts
 COPY rootfs/ /