diff --git a/build/rebuild.sh b/build/rebuild.sh
new file mode 100755
index 0000000..41a1af8
--- /dev/null
+++ b/build/rebuild.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+updates_available () {
+    docker pull $1
+    if test "$(docker run -it --rm $1 /bin/sh -c 'apt -qqq update && apt -qq list --upgradable')" != ""; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+if updates_available pommib/powerdns:4.4-bullseye; then
+    ./debian/11/build.sh
+fi
+
+if updates_available pommib/powerdns:4.6-bookworm; then
+    ./debian/12/build.sh
+fi
diff --git a/debian/11/Dockerfile b/debian/11/Dockerfile
index b14e687..70beedd 100644
--- a/debian/11/Dockerfile
+++ b/debian/11/Dockerfile
@@ -2,6 +2,7 @@ FROM debian:bullseye-slim
 
 RUN set -eux; \
 	apt-get update; \
+	apt-get upgrade -y; \
 	apt-get install -y --no-install-recommends \
 		pdns-server \
 		pdns-backend-bind \
diff --git a/debian/11/build.sh b/debian/11/build.sh
new file mode 100755
index 0000000..c7a1f93
--- /dev/null
+++ b/debian/11/build.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+set -x
+
+IMAGE=pommib/powerdns:4.4-bullseye
+docker pull $IMAGE
+docker pull debian:bullseye-slim
+docker build --no-cache -t $IMAGE ./debian/11/
+docker push $IMAGE
diff --git a/debian/12/Dockerfile b/debian/12/Dockerfile
index 51a730c..57fe68b 100644
--- a/debian/12/Dockerfile
+++ b/debian/12/Dockerfile
@@ -2,6 +2,7 @@ FROM debian:bookworm-slim
 
 RUN set -eux; \
 	apt-get update; \
+	apt-get upgrade -y; \
 	apt-get install -y --no-install-recommends \
 		pdns-server \
 		pdns-backend-bind \
diff --git a/debian/12/build.sh b/debian/12/build.sh
new file mode 100755
index 0000000..acb58d4
--- /dev/null
+++ b/debian/12/build.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -x
+
+IMAGE=pommib/powerdns:4.6-bookworm
+docker pull $IMAGE
+docker pull debian:bookworm-slim
+docker build --no-cache -t $IMAGE ./debian/12/
+docker push $IMAGE
+
+docker tag $IMAGE pommib/powerdns:latest
+docker push pommib/powerdns:latest