diff --git a/Dockerfile b/Dockerfile
index 36c29b8..c8e4ce5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,6 +17,7 @@ RUN \
 	wget && \
  echo "**** install runtime packages ****" && \
  apk add --no-cache \
+	bind-tools \
 	curl \
 	inotify-tools \
 	jq \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 9970433..241c7ad 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -17,6 +17,7 @@ RUN \
 	wget && \
  echo "**** install runtime packages ****" && \
  apk add --no-cache \
+	bind-tools \
 	curl \
 	inotify-tools \
 	jq \
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index 89647c9..9112ef6 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -17,6 +17,7 @@ RUN \
 	wget && \
  echo "**** install runtime packages ****" && \
  apk add --no-cache \
+	bind-tools \
 	curl \
 	inotify-tools \
 	jq \
diff --git a/readme-vars.yml b/readme-vars.yml
index 9f5c490..a7cb69d 100644
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -46,6 +46,7 @@ app_setup_block: |
 
 # changelog
 changelogs:
+  - { date: "08.03.21:", desc: "Added bind-tools to provide nsupdate" }
   - { date: "01.06.20:", desc: "Rebasing to alpine 3.12." }
   - { date: "08.02.20:", desc: "Ingest from Github." }
   - { date: "06.02.19:", desc: "Fix permissions." }