diff --git a/bitnami/prometheus/2/debian-9/Dockerfile b/bitnami/prometheus/2/debian-9/Dockerfile
index 16b40e4c034c..f4c1bcc3090d 100644
--- a/bitnami/prometheus/2/debian-9/Dockerfile
+++ b/bitnami/prometheus/2/debian-9/Dockerfile
@@ -13,7 +13,7 @@ LABEL maintainer "Bitnami <containers@bitnami.com>"
 
 COPY --from=buildenv /opt/bitnami/prometheus /opt/bitnami/prometheus
 ENV BITNAMI_APP_NAME="prometheus" \
-    BITNAMI_IMAGE_VERSION="2.3.2-debian-9-r20" \
+    BITNAMI_IMAGE_VERSION="2.3.2-debian-9-r21" \
     PATH="/opt/bitnami/prometheus/bin:$PATH"
 
 RUN mkdir -p /opt/bitnami/prometheus/data/ && chmod g+rwX /opt/bitnami/prometheus/data/
diff --git a/bitnami/prometheus/README.md b/bitnami/prometheus/README.md
index acd9e9ed5ab3..c30f099c673d 100644
--- a/bitnami/prometheus/README.md
+++ b/bitnami/prometheus/README.md
@@ -37,7 +37,7 @@ $ docker run --name prometheus bitnami/prometheus:latest
 
 
 * [`2-ol-7`, `2.3.2-ol-7-r18` (2/ol-7/Dockerfile)](https://github.com/bitnami/bitnami-docker-prometheus/blob/2.3.2-ol-7-r18/2/ol-7/Dockerfile)
-* [`2-debian-9`, `2.3.2-debian-9-r20`, `2`, `2.3.2`, `2.3.2-r20`, `latest` (2/Dockerfile)](https://github.com/bitnami/bitnami-docker-prometheus/blob/2.3.2-debian-9-r20/2/Dockerfile)
+* [`2-debian-9`, `2.3.2-debian-9-r21`, `2`, `2.3.2`, `2.3.2-r21`, `latest` (2/Dockerfile)](https://github.com/bitnami/bitnami-docker-prometheus/blob/2.3.2-debian-9-r21/2/Dockerfile)
 
 Subscribe to project updates by watching the [bitnami/prometheus GitHub repo](https://github.com/bitnami/bitnami-docker-prometheus).