diff --git a/README.md b/README.md
index 02de97c..ca7b888 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ # vegardit/openldap <a href="https://github.com/vegardit/docker-openldap/" title
 
 ## <a name="what-is-it"></a>What is it?
 
-Opinionated docker image based on the [Debian](https://www.debian.org/) docker image [`debian:stable-slim`](https://hub.docker.com/_/debian?tab=tags&name=stable-slim) to run an [OpenLDAP 2.4](https://www.openldap.org/doc/admin24/) server.
+Opinionated docker image is currently based on the [Debian](https://www.debian.org/) docker image [`debian:bullseye-slim`](https://hub.docker.com/_/debian?tab=tags&name=bullseye-slim) to run an [OpenLDAP 2.4](https://www.openldap.org/doc/admin24/) server.
 
 It is automatically built **daily** to include the latest OS security fixes.
 
diff --git a/build-image.sh b/build-image.sh
index ddaaa57..eeb7f25 100644
--- a/build-image.sh
+++ b/build-image.sh
@@ -17,7 +17,7 @@ source "$shared_lib/lib/build-image-init.sh"
 #################################################
 docker_registry=${DOCKER_REGISTRY:-docker.io}
 image_repo=${DOCKER_IMAGE_REPO:-vegardit/openldap}
-base_image_name=${DOCKER_BASE_IMAGE:-debian:stable-slim}
+base_image_name=${DOCKER_BASE_IMAGE:-debian:bullseye-slim}
 base_image_tag=${base_image_name#*:}
 image_name=$image_repo:latest
 
@@ -58,7 +58,7 @@ echo "ldap_version=$ldap_version"
 #################################################
 # apply tags
 #################################################
-declare -a tags=() 
+declare -a tags=()
 tags+=($image_name) # :latest
 tags+=($image_repo:${ldap_version})       # :2.4.47
 tags+=($image_repo:${ldap_version%.*}.x)  # :2.4.x
diff --git a/image/Dockerfile b/image/Dockerfile
index 6a0a457..9d7f21f 100644
--- a/image/Dockerfile
+++ b/image/Dockerfile
@@ -7,8 +7,8 @@
 # https://github.com/vegardit/docker-openldap
 #
 
-# https://hub.docker.com/_/debian?tab=tags&name=stable-slim
-ARG BASE_IMAGE=debian:stable-slim
+# https://hub.docker.com/_/debian?tab=tags&name=bullseye-slim
+ARG BASE_IMAGE=debian:bullseye-slim
 
 FROM ${BASE_IMAGE}