diff --git a/jenkins-common.sh b/jenkins-common.sh
index f91c6151..f069ffc1 100644
--- a/jenkins-common.sh
+++ b/jenkins-common.sh
@@ -23,7 +23,7 @@ docker_depends() {
 	osmo-*-latest) echo "debian-$DEBIAN_DEFAULT-obs-latest" ;;
 	osmo-*) echo "debian-$DEBIAN_DEFAULT-build" ;;
 	open5gs-master) echo "debian-$DEBIAN_DEFAULT-build" ;;
-	ttcn3-*) echo "debian-bullseye-titan" ;;
+	ttcn3-*) echo "debian-bookworm-titan" ;;
 	esac
 }
 
@@ -147,7 +147,7 @@ docker_images_require() {
 		# they are up-to-date.
 		if [ "$REGISTRY_HOST" = "registry.osmocom.org" ]; then
 			case "$i" in
-			debian-bullseye-titan)
+			debian-bookworm-titan)
 				docker pull "$REGISTRY_HOST/$USER/$i"
 				continue
 				;;
diff --git a/nplab-m3ua-test/jenkins.sh b/nplab-m3ua-test/jenkins.sh
index 1b716712..3db87459 100755
--- a/nplab-m3ua-test/jenkins.sh
+++ b/nplab-m3ua-test/jenkins.sh
@@ -6,7 +6,7 @@ docker_images_require \
 	"debian-buster-build" \
 	"sigtran-tests" \
 	"osmo-stp-$IMAGE_SUFFIX" \
-	"debian-bullseye-titan" \
+	"debian-bookworm-titan" \
 	"nplab-m3ua-test"
 
 set_clean_up_trap
diff --git a/nplab-sua-test/jenkins.sh b/nplab-sua-test/jenkins.sh
index 6ee52eeb..a9fbadf6 100755
--- a/nplab-sua-test/jenkins.sh
+++ b/nplab-sua-test/jenkins.sh
@@ -5,7 +5,7 @@ IMAGE_SUFFIX="${IMAGE_SUFFIX:-master}"
 docker_images_require \
 	"debian-buster-build" \
 	"osmo-stp-$IMAGE_SUFFIX" \
-	"debian-bullseye-titan" \
+	"debian-bookworm-titan" \
 	"sigtran-tests" \
 	"nplab-sua-test"
 
diff --git a/ttcn3-bsc-test-vamos/Dockerfile b/ttcn3-bsc-test-vamos/Dockerfile
index eac8f460..963c8de7 100644
--- a/ttcn3-bsc-test-vamos/Dockerfile
+++ b/ttcn3-bsc-test-vamos/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-bsc-test/Dockerfile b/ttcn3-bsc-test/Dockerfile
index eac8f460..963c8de7 100644
--- a/ttcn3-bsc-test/Dockerfile
+++ b/ttcn3-bsc-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-bscnat-test/Dockerfile b/ttcn3-bscnat-test/Dockerfile
index 07377c80..67489756 100644
--- a/ttcn3-bscnat-test/Dockerfile
+++ b/ttcn3-bscnat-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-bts-test/Dockerfile b/ttcn3-bts-test/Dockerfile
index 386ac3b5..e99a7c60 100644
--- a/ttcn3-bts-test/Dockerfile
+++ b/ttcn3-bts-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-cbc-test/Dockerfile b/ttcn3-cbc-test/Dockerfile
index 4048f20b..784eb255 100644
--- a/ttcn3-cbc-test/Dockerfile
+++ b/ttcn3-cbc-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-fr-test/Dockerfile b/ttcn3-fr-test/Dockerfile
index f237e8ba..961eeefa 100644
--- a/ttcn3-fr-test/Dockerfile
+++ b/ttcn3-fr-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-gbproxy-test/Dockerfile b/ttcn3-gbproxy-test/Dockerfile
index c215d62d..1026180e 100644
--- a/ttcn3-gbproxy-test/Dockerfile
+++ b/ttcn3-gbproxy-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-ggsn-test/Dockerfile b/ttcn3-ggsn-test/Dockerfile
index 36778c9e..447ddebc 100644
--- a/ttcn3-ggsn-test/Dockerfile
+++ b/ttcn3-ggsn-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-hlr-test/Dockerfile b/ttcn3-hlr-test/Dockerfile
index e8b80a80..df3396da 100644
--- a/ttcn3-hlr-test/Dockerfile
+++ b/ttcn3-hlr-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-hnbgw-test/Dockerfile b/ttcn3-hnbgw-test/Dockerfile
index c37e1bfa..3b4e930f 100644
--- a/ttcn3-hnbgw-test/Dockerfile
+++ b/ttcn3-hnbgw-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-hnodeb-test/Dockerfile b/ttcn3-hnodeb-test/Dockerfile
index 6783abd5..df6cb942 100644
--- a/ttcn3-hnodeb-test/Dockerfile
+++ b/ttcn3-hnodeb-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-mgw-test/Dockerfile b/ttcn3-mgw-test/Dockerfile
index bfc0b9ee..e8aad683 100644
--- a/ttcn3-mgw-test/Dockerfile
+++ b/ttcn3-mgw-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-mme-test-ogs/Dockerfile b/ttcn3-mme-test-ogs/Dockerfile
index 048a8e8c..0f9d6884 100644
--- a/ttcn3-mme-test-ogs/Dockerfile
+++ b/ttcn3-mme-test-ogs/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 
 RUN	apt-get update && \
 	apt-get upgrade -y && \
diff --git a/ttcn3-msc-test/Dockerfile b/ttcn3-msc-test/Dockerfile
index 9bcd891b..6fe48d46 100644
--- a/ttcn3-msc-test/Dockerfile
+++ b/ttcn3-msc-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-nitb-sysinfo/Dockerfile b/ttcn3-nitb-sysinfo/Dockerfile
index 12ebee4d..1c315137 100644
--- a/ttcn3-nitb-sysinfo/Dockerfile
+++ b/ttcn3-nitb-sysinfo/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-ns-test/Dockerfile b/ttcn3-ns-test/Dockerfile
index d39f4935..aa103372 100644
--- a/ttcn3-ns-test/Dockerfile
+++ b/ttcn3-ns-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-pcap-client-test/Dockerfile b/ttcn3-pcap-client-test/Dockerfile
index 10c829bc..7cfd9402 100644
--- a/ttcn3-pcap-client-test/Dockerfile
+++ b/ttcn3-pcap-client-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-pcu-test/Dockerfile b/ttcn3-pcu-test/Dockerfile
index e97ac409..9ed86904 100644
--- a/ttcn3-pcu-test/Dockerfile
+++ b/ttcn3-pcu-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-pgw-test/Dockerfile b/ttcn3-pgw-test/Dockerfile
index 5233c5ea..5e539020 100644
--- a/ttcn3-pgw-test/Dockerfile
+++ b/ttcn3-pgw-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-remsim-test/Dockerfile b/ttcn3-remsim-test/Dockerfile
index b902e2da..650c07cd 100644
--- a/ttcn3-remsim-test/Dockerfile
+++ b/ttcn3-remsim-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-sccp-test/Dockerfile b/ttcn3-sccp-test/Dockerfile
index 68fd2c03..8d527873 100644
--- a/ttcn3-sccp-test/Dockerfile
+++ b/ttcn3-sccp-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-sgsn-test/Dockerfile b/ttcn3-sgsn-test/Dockerfile
index da670443..eba4ddd2 100644
--- a/ttcn3-sgsn-test/Dockerfile
+++ b/ttcn3-sgsn-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-sip-test/Dockerfile b/ttcn3-sip-test/Dockerfile
index 53d70db3..7418ea64 100644
--- a/ttcn3-sip-test/Dockerfile
+++ b/ttcn3-sip-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-smlc-test/Dockerfile b/ttcn3-smlc-test/Dockerfile
index f5dd8908..6c41c1c7 100644
--- a/ttcn3-smlc-test/Dockerfile
+++ b/ttcn3-smlc-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-stp-test/Dockerfile b/ttcn3-stp-test/Dockerfile
index 256132d9..995ef53e 100644
--- a/ttcn3-stp-test/Dockerfile
+++ b/ttcn3-stp-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit
diff --git a/ttcn3-upf-test/Dockerfile b/ttcn3-upf-test/Dockerfile
index c0e3d6cf..665d818a 100644
--- a/ttcn3-upf-test/Dockerfile
+++ b/ttcn3-upf-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-bullseye-titan
+FROM	$REGISTRY/$USER/debian-bookworm-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	https://gerrit.osmocom.org/plugins/gitiles/osmo-ttcn3-hacks/+/$OSMO_TTCN3_BRANCH?format=TEXT /tmp/commit