diff --git a/bitnami/redis-sentinel/6.0/debian-10/Dockerfile b/bitnami/redis-sentinel/6.0/debian-10/Dockerfile
index dc02f33d1401..9688018a29d1 100644
--- a/bitnami/redis-sentinel/6.0/debian-10/Dockerfile
+++ b/bitnami/redis-sentinel/6.0/debian-10/Dockerfile
@@ -19,7 +19,7 @@ RUN chmod g+rwX /opt/bitnami
 COPY rootfs /
 RUN /opt/bitnami/scripts/redis-sentinel/postunpack.sh
 ENV BITNAMI_APP_NAME="redis-sentinel" \
-    BITNAMI_IMAGE_VERSION="6.0.10-debian-10-r3"
+    BITNAMI_IMAGE_VERSION="6.0.10-debian-10-r4"
 
 EXPOSE 26379
 
diff --git a/bitnami/redis-sentinel/6.0/debian-10/prebuildfs/opt/bitnami/scripts/libos.sh b/bitnami/redis-sentinel/6.0/debian-10/prebuildfs/opt/bitnami/scripts/libos.sh
index f38437a1d407..6a7512281470 100644
--- a/bitnami/redis-sentinel/6.0/debian-10/prebuildfs/opt/bitnami/scripts/libos.sh
+++ b/bitnami/redis-sentinel/6.0/debian-10/prebuildfs/opt/bitnami/scripts/libos.sh
@@ -6,6 +6,7 @@
 
 # Load Generic Libraries
 . /opt/bitnami/scripts/liblog.sh
+. /opt/bitnami/scripts/libfs.sh
 
 # Functions
 
@@ -118,7 +119,7 @@ ensure_user_exists() {
         local -a group_args=("$group")
         $is_system_user && group_args+=("--system")
         ensure_group_exists "${group_args[@]}"
-        usermod -a -G "$group" "$user" >/dev/null 2>&1
+        usermod -g "$group" "$user" >/dev/null 2>&1
     fi
 
     if [[ -n "$home" ]]; then
diff --git a/bitnami/redis-sentinel/README.md b/bitnami/redis-sentinel/README.md
index 1e82055b417a..d83c32b4e56c 100644
--- a/bitnami/redis-sentinel/README.md
+++ b/bitnami/redis-sentinel/README.md
@@ -47,7 +47,7 @@ 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/).
 
 
-* [`6.0`, `6.0-debian-10`, `6.0.10`, `6.0.10-debian-10-r3`, `latest` (6.0/debian-10/Dockerfile)](https://github.com/bitnami/bitnami-docker-redis-sentinel/blob/6.0.10-debian-10-r3/6.0/debian-10/Dockerfile)
+* [`6.0`, `6.0-debian-10`, `6.0.10`, `6.0.10-debian-10-r4`, `latest` (6.0/debian-10/Dockerfile)](https://github.com/bitnami/bitnami-docker-redis-sentinel/blob/6.0.10-debian-10-r4/6.0/debian-10/Dockerfile)
 * [`5.0`, `5.0-debian-10`, `5.0.10`, `5.0.10-debian-10-r78` (5.0/debian-10/Dockerfile)](https://github.com/bitnami/bitnami-docker-redis-sentinel/blob/5.0.10-debian-10-r78/5.0/debian-10/Dockerfile)
 
 Subscribe to project updates by watching the [bitnami/redis-sentinel GitHub repo](https://github.com/bitnami/bitnami-docker-redis-sentinel).