diff --git a/bitnami/alertmanager/0/ol-7/Dockerfile b/bitnami/alertmanager/0/ol-7/Dockerfile
index 89611f8007dc..0c585448aaa9 100644
--- a/bitnami/alertmanager/0/ol-7/Dockerfile
+++ b/bitnami/alertmanager/0/ol-7/Dockerfile
@@ -1,4 +1,4 @@
-FROM bitnami/oraclelinux-extras:7-r27 as buildenv
+FROM bitnami/oraclelinux-extras:7-r28 as buildenv
 
 RUN install_packages ca-certificates wget
 RUN wget -nc -P /tmp/bitnami/pkg/cache/ https://downloads.bitnami.com/files/stacksmith/alertmanager-0.15.0-0-linux-x86_64-ol-7.tar.gz && \
@@ -8,12 +8,12 @@ RUN wget -nc -P /tmp/bitnami/pkg/cache/ https://downloads.bitnami.com/files/stac
 
 ##################
 
-FROM bitnami/oraclelinux-extras:7-r27
+FROM bitnami/oraclelinux-extras:7-r28
 LABEL maintainer "Bitnami <containers@bitnami.com>"
 
 COPY --from=buildenv /opt/bitnami/alertmanager /opt/bitnami/alertmanager
 ENV BITNAMI_APP_NAME="alertmanager" \
-    BITNAMI_IMAGE_VERSION="0.15.0-ol-7-r0" \
+    BITNAMI_IMAGE_VERSION="0.15.0-ol-7-r1" \
     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 05ae1fd6ea2b..8d0f9d8907e4 100644
--- a/bitnami/alertmanager/README.md
+++ b/bitnami/alertmanager/README.md
@@ -22,8 +22,8 @@ $ docker run --name alertmanager bitnami/alertmanager:latest
 
 # Supported tags and respective `Dockerfile` links
 
-* [`0-ol-7`, `0.15.0-ol-7-r0` (0/ol-7/Dockerfile)](https://github.com/bitnami/bitnami-docker-alertmanager/blob/0.15.0-ol-7-r0/0/ol-7/Dockerfile)
-* [`0-debian-9`, `0.15.0-debian-9-r1` (0/debian-9/Dockerfile)](https://github.com/bitnami/bitnami-docker-alertmanager/blob/0.15.0-debian-9-r1/0/debian-9/Dockerfile)
+* [`0-ol-7`, `0.15.0-ol-7-r1` (0/ol-7/Dockerfile)](https://github.com/bitnami/bitnami-docker-alertmanager/blob/0.15.0-ol-7-r1/0/ol-7/Dockerfile)
+* [`0-debian-9`, `0.15.0-debian-9-r0` (0/debian-9/Dockerfile)](https://github.com/bitnami/bitnami-docker-alertmanager/blob/0.15.0-debian-9-r0/0/debian-9/Dockerfile)
 * [`0-debian-8`, `0.15.0-debian-8-r1`, `0`, `0.15.0`, `0.15.0-r1`, `latest` (0/Dockerfile)](https://github.com/bitnami/bitnami-docker-alertmanager/blob/0.15.0-debian-8-r1/0/Dockerfile)
 
 Subscribe to project updates by watching the [bitnami/alertmanager GitHub repo](https://github.com/bitnami/bitnami-docker-alertmanager).