diff --git a/bitnami/alertmanager/0/debian-9/Dockerfile b/bitnami/alertmanager/0/debian-9/Dockerfile
index 3b755935a3f2..41247030a9cb 100644
--- a/bitnami/alertmanager/0/debian-9/Dockerfile
+++ b/bitnami/alertmanager/0/debian-9/Dockerfile
@@ -13,7 +13,7 @@ LABEL maintainer "Bitnami <containers@bitnami.com>"
 
 COPY --from=buildenv /opt/bitnami/alertmanager /opt/bitnami/alertmanager
 ENV BITNAMI_APP_NAME="alertmanager" \
-    BITNAMI_IMAGE_VERSION="0.15.1-debian-9-r19" \
+    BITNAMI_IMAGE_VERSION="0.15.1-debian-9-r20" \
     PATH="/opt/bitnami/alertmanager/bin:$PATH"
 
 RUN mkdir -p /opt/bitnami/alertmanager/data/ && chmod g+rwX /opt/bitnami/alertmanager/data/
diff --git a/bitnami/alertmanager/README.md b/bitnami/alertmanager/README.md
index d2a8832d7a41..75f95b2dab78 100644
--- a/bitnami/alertmanager/README.md
+++ b/bitnami/alertmanager/README.md
@@ -28,7 +28,7 @@ Learn more about the Bitnami tagging policy and the difference between rolling t
 
 
 * [`0-ol-7`, `0.15.1-ol-7-r15` (0/ol-7/Dockerfile)](https://github.com/bitnami/bitnami-docker-alertmanager/blob/0.15.1-ol-7-r15/0/ol-7/Dockerfile)
-* [`0-debian-9`, `0.15.1-debian-9-r19`, `0`, `0.15.1`, `0.15.1-r19`, `latest` (0/Dockerfile)](https://github.com/bitnami/bitnami-docker-alertmanager/blob/0.15.1-debian-9-r19/0/Dockerfile)
+* [`0-debian-9`, `0.15.1-debian-9-r20`, `0`, `0.15.1`, `0.15.1-r20`, `latest` (0/Dockerfile)](https://github.com/bitnami/bitnami-docker-alertmanager/blob/0.15.1-debian-9-r20/0/Dockerfile)
 
 Subscribe to project updates by watching the [bitnami/alertmanager GitHub repo](https://github.com/bitnami/bitnami-docker-alertmanager).