diff --git a/bitnami/alertmanager/0/debian-11/Dockerfile b/bitnami/alertmanager/0/debian-11/Dockerfile
index 04a18ccfdc86..4747376d632d 100644
--- a/bitnami/alertmanager/0/debian-11/Dockerfile
+++ b/bitnami/alertmanager/0/debian-11/Dockerfile
@@ -4,7 +4,7 @@ ARG TARGETARCH
 
 LABEL org.opencontainers.image.authors="https://bitnami.com/contact" \
       org.opencontainers.image.description="Application packaged by Bitnami" \
-      org.opencontainers.image.ref.name="0.24.0-debian-11-r38" \
+      org.opencontainers.image.ref.name="0.24.0-debian-11-r39" \
       org.opencontainers.image.source="https://github.com/bitnami/containers/tree/main/bitnami/alertmanager" \
       org.opencontainers.image.title="alertmanager" \
       org.opencontainers.image.vendor="VMware, Inc." \
@@ -28,7 +28,7 @@ RUN mkdir -p /tmp/bitnami/pkg/cache/ && cd /tmp/bitnami/pkg/cache/ && \
     tar -zxf alertmanager-0.24.0-155-linux-${OS_ARCH}-debian-11.tar.gz -C /opt/bitnami --strip-components=2 --no-same-owner --wildcards '*/files' && \
     rm -rf alertmanager-0.24.0-155-linux-${OS_ARCH}-debian-11.tar.gz alertmanager-0.24.0-155-linux-${OS_ARCH}-debian-11.tar.gz.sha256
 RUN apt-get update && apt-get upgrade -y && \
-    rm -r /var/lib/apt/lists /var/cache/apt/archives
+    apt-get clean && rm -rf /var/lib/apt/lists /var/cache/apt/archives
 RUN ln -sf /opt/bitnami/alertmanager/conf /etc/alertmanager
 RUN ln -sf /opt/bitnami/alertmanager/data /alertmanager
 RUN chmod g+rwX /opt/bitnami
diff --git a/bitnami/alertmanager/0/debian-11/prebuildfs/usr/sbin/install_packages b/bitnami/alertmanager/0/debian-11/prebuildfs/usr/sbin/install_packages
index c9577647443b..77857a1a57f2 100755
--- a/bitnami/alertmanager/0/debian-11/prebuildfs/usr/sbin/install_packages
+++ b/bitnami/alertmanager/0/debian-11/prebuildfs/usr/sbin/install_packages
@@ -1,9 +1,10 @@
 #!/bin/sh
-set -e
-set -u
-export DEBIAN_FRONTEND=noninteractive
+set -eu
+
 n=0
 max=2
+export DEBIAN_FRONTEND=noninteractive
+
 until [ $n -gt $max ]; do
     set +e
     (
@@ -21,4 +22,4 @@ until [ $n -gt $max ]; do
     echo "apt failed, retrying"
     n=$(($n + 1))
 done
-rm -r /var/lib/apt/lists /var/cache/apt/archives
+apt-get clean && rm -rf /var/lib/apt/lists /var/cache/apt/archives
diff --git a/bitnami/alertmanager/README.md b/bitnami/alertmanager/README.md
index 36dd87dd826c..77f1cacc9f5c 100644
--- a/bitnami/alertmanager/README.md
+++ b/bitnami/alertmanager/README.md
@@ -32,7 +32,7 @@ Non-root container images add an extra layer of security and are generally recom
 Learn more about the Bitnami tagging policy and the difference between rolling tags and immutable tags [in our documentation page](https://docs.bitnami.com/tutorials/understand-rolling-tags-containers/).
 
 
-* [`0`, `0-debian-11`, `0.24.0`, `0.24.0-debian-11-r38`, `latest` (0/debian-11/Dockerfile)](https://github.com/bitnami/containers/blob/main/bitnami/alertmanager/0/debian-11/Dockerfile)
+* [`0`, `0-debian-11`, `0.24.0`, `0.24.0-debian-11-r39`, `latest` (0/debian-11/Dockerfile)](https://github.com/bitnami/containers/blob/main/bitnami/alertmanager/0/debian-11/Dockerfile)
 
 Subscribe to project updates by watching the [bitnami/containers GitHub repo](https://github.com/bitnami/containers).