diff --git a/Dockerfile.dbg b/Dockerfile.dbg
index 665cfbc9..2bf82314 100644
--- a/Dockerfile.dbg
+++ b/Dockerfile.dbg
@@ -46,7 +46,7 @@ RUN mkdir ~/.gnupg
 RUN echo "disable-ipv6" >> ~/.gnupg/dirmngr.conf
 
 RUN set -x \
-  && apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys B7B3B788A8D3785C
+  && wget -qO- http://keyserver.ubuntu.com:80/pks/lookup?op=get&search=0xB7B3B788A8D3785C > /etc/apt/trusted.gpg.d/myrepo.asc
 
 RUN set -x \
   && apt-get update \
diff --git a/Dockerfile.in b/Dockerfile.in
index 9ca16383..31bad936 100644
--- a/Dockerfile.in
+++ b/Dockerfile.in
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM debian:bullseye
+FROM debian:bookworm
 
 ENV DEBIAN_FRONTEND noninteractive
 ENV DEBCONF_NONINTERACTIVE_SEEN true
@@ -46,7 +46,7 @@ RUN mkdir ~/.gnupg
 RUN echo "disable-ipv6" >> ~/.gnupg/dirmngr.conf
 
 RUN set -x \
-  && apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys B7B3B788A8D3785C
+  && wget -qO- http://keyserver.ubuntu.com:80/pks/lookup?op=get&search=0xB7B3B788A8D3785C > /etc/apt/trusted.gpg.d/myrepo.asc
 
 RUN set -x \
   && apt-get update \
diff --git a/pkg/backup.go b/pkg/backup.go
index 0e3f4940..1b86f0f0 100644
--- a/pkg/backup.go
+++ b/pkg/backup.go
@@ -19,6 +19,7 @@ package pkg
 import (
 	"context"
 	"path/filepath"
+	"strings"
 
 	api_v1beta1 "stash.appscode.dev/apimachinery/apis/stash/v1beta1"
 	stash "stash.appscode.dev/apimachinery/client/clientset/versioned"
@@ -221,6 +222,9 @@ func (opt *mysqlOptions) backupMySQL(targetRef api_v1beta1.TargetRef) (*restic.B
 	}
 
 	session.setUserArgs(opt.myArgs)
+	if strings.Contains(opt.myArgs, "--all-databases") {
+		session.cmd.Args = append(session.cmd.Args, "--ignore-table=mysql.user")
+	}
 
 	// add backup command in the pipeline
 	opt.backupOptions.StdinPipeCommands = append(opt.backupOptions.StdinPipeCommands, *session.cmd)