diff --git a/Dockerfile b/Dockerfile
index 3b26d0e..c167d0e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ FROM gcr.io/etcd-development/etcd:v3.4.13-arm64 as source-arm64
 
 FROM source-$TARGETARCH as source
 
-FROM alpine:3.18.2
+FROM alpine:3.18.3
 
 WORKDIR /
 
diff --git a/Dockerfile-e b/Dockerfile-e
deleted file mode 100644
index bcf1eac..0000000
--- a/Dockerfile-e
+++ /dev/null
@@ -1,14 +0,0 @@
-# SPDX-FileCopyrightText: 2020 SAP SE or an SAP affiliate company and Gardener contributors
-# SPDX-License-Identifier: Apache-2.0
-
-FROM gcr.io/etcd-development/etcd:%%ETCD_VERSION%% as source
-FROM alpine:3.18.2
-
-WORKDIR /
-
-RUN apk add --update bash curl wget openssl
-
-COPY --from=source /usr/local/bin/etcd /usr/local/bin
-COPY --from=source /usr/local/bin/etcdctl /usr/local/bin
-
-ENTRYPOINT ["/var/etcd/bin/bootstrap.sh"]
diff --git a/Dockerfile.template b/Dockerfile.template
index cb308df..419aa99 100644
--- a/Dockerfile.template
+++ b/Dockerfile.template
@@ -6,7 +6,7 @@ FROM gcr.io/etcd-development/etcd:ETCD_VERSION as source-arm64
 
 FROM source-$TARGETARCH as source
 
-FROM alpine:3.18.2
+FROM alpine:3.18.3
 
 WORKDIR /
 
diff --git a/VERSION b/VERSION
index da457ef..e7759b1 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-v3.4.13-bootstrap-12
+v3.4.13-bootstrap-13