diff --git a/Dockerfile b/Dockerfile
index 5a3c773..5410058 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,12 +18,15 @@ ARG BUILD_MAINTAINER
 LABEL build_version="${BUILD_MAINTAINER} version: ${BUILD_APP_VERSION} Build-date:- ${BUILD_DATE}"
 LABEL maintainer="${BUILD_MAINTAINER}"
 
-# 1. EPEL und Basis-Tools (shadow-utils ist kritisch für useradd!)
-RUN microdnf install -y --nodocs \
-    https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm && \
+# 1. Basis-Setup: Zertifikate und EPEL
+RUN microdnf install -y --nodocs ca-certificates && \
+    rpm -ivh https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm && \
     microdnf update -y && \
     microdnf install -y --nodocs \
-    xz tar shadow-utils tzdata && \
+    xz \
+    tar \
+    shadow-utils \
+    tzdata && \
     microdnf clean all
 
 # add s6 overlay
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 55aec12..ce302f7 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -17,12 +17,15 @@ ARG BUILD_MAINTAINER
 LABEL build_version="${BUILD_MAINTAINER} version: ${BUILD_APP_VERSION} Build-date:- ${BUILD_DATE}"
 LABEL maintainer="${BUILD_MAINTAINER}"
 
-# 1. EPEL und Basis-Tools (shadow-utils ist kritisch für useradd!)
-RUN microdnf install -y --nodocs \
-    https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm && \
+# 1. Basis-Setup: Zertifikate und EPEL
+RUN microdnf install -y --nodocs ca-certificates && \
+    rpm -ivh https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm && \
     microdnf update -y && \
     microdnf install -y --nodocs \
-    xz tar shadow-utils tzdata && \
+    xz \
+    tar \
+    shadow-utils \
+    tzdata && \
     microdnf clean all
 
 # 2. S6 Overlay hinzufügen (explizit für aarch64)