diff --git a/debian-stretch-titan/.release b/debian-bullseye-titan/.release
similarity index 100%
rename from debian-stretch-titan/.release
rename to debian-bullseye-titan/.release
diff --git a/debian-stretch-titan/Dockerfile b/debian-bullseye-titan/Dockerfile
similarity index 97%
rename from debian-stretch-titan/Dockerfile
rename to debian-bullseye-titan/Dockerfile
index d3489147..bf99534c 100644
--- a/debian-stretch-titan/Dockerfile
+++ b/debian-bullseye-titan/Dockerfile
@@ -1,12 +1,12 @@
 ARG	REGISTRY=docker.io
-ARG	UPSTREAM_DISTRO=debian:stretch
+ARG	UPSTREAM_DISTRO=debian:bullseye
 FROM	${REGISTRY}/${UPSTREAM_DISTRO}
 # Arguments used after FROM must be specified again
 ARG	OSMOCOM_REPO_TESTSUITE_MIRROR="http://download.opensuse.org"
 
 MAINTAINER Harald Welte <laforge@gnumonks.org>
 
-ARG	OSMOCOM_REPO="$OSMOCOM_REPO_TESTSUITE_MIRROR/repositories/network:/osmocom:/latest/Debian_9.0/"
+ARG	OSMOCOM_REPO="$OSMOCOM_REPO_TESTSUITE_MIRROR/repositories/network:/osmocom:/latest/Debian_11/"
 
 RUN	apt-get update && apt-get install -y \
 		gnupg
diff --git a/debian-stretch-titan/Makefile b/debian-bullseye-titan/Makefile
similarity index 100%
rename from debian-stretch-titan/Makefile
rename to debian-bullseye-titan/Makefile
diff --git a/debian-stretch-titan/pipework b/debian-bullseye-titan/pipework
similarity index 100%
rename from debian-stretch-titan/pipework
rename to debian-bullseye-titan/pipework
diff --git a/debian-stretch-titan/ttcn3-docker-prepare.sh b/debian-bullseye-titan/ttcn3-docker-prepare.sh
similarity index 100%
rename from debian-stretch-titan/ttcn3-docker-prepare.sh
rename to debian-bullseye-titan/ttcn3-docker-prepare.sh
diff --git a/debian-stretch-titan/ttcn3-docker-run.sh b/debian-bullseye-titan/ttcn3-docker-run.sh
similarity index 100%
rename from debian-stretch-titan/ttcn3-docker-run.sh
rename to debian-bullseye-titan/ttcn3-docker-run.sh
diff --git a/jenkins-common.sh b/jenkins-common.sh
index 2e91c14a..9610676b 100644
--- a/jenkins-common.sh
+++ b/jenkins-common.sh
@@ -21,7 +21,7 @@ docker_depends() {
 	osmo-*-centos8) echo "centos8-build" ;;
 	osmo-*-latest) echo "debian-stretch-obs-latest" ;;
 	osmo-*) echo "debian-stretch-build" ;;
-	ttcn3-*) echo "debian-stretch-titan" ;;
+	ttcn3-*) echo "debian-bullseye-titan" ;;
 	esac
 }
 
@@ -135,7 +135,7 @@ docker_images_require() {
 		# they are up-to-date.
 		if [ "$REGISTRY_HOST" = "registry.osmocom.org" ]; then
 			case "$i" in
-			debian-stretch-titan)
+			debian-bullseye-titan)
 				docker pull "$REGISTRY_HOST/$USER/$i"
 				continue
 				;;
diff --git a/nplab-m3ua-test/jenkins.sh b/nplab-m3ua-test/jenkins.sh
index 3be308a6..c4250b0f 100755
--- a/nplab-m3ua-test/jenkins.sh
+++ b/nplab-m3ua-test/jenkins.sh
@@ -6,7 +6,7 @@ docker_images_require \
 	"debian-stretch-build" \
 	"sigtran-tests" \
 	"osmo-stp-$IMAGE_SUFFIX" \
-	"debian-stretch-titan" \
+	"debian-bullseye-titan" \
 	"nplab-m3ua-test"
 
 set_clean_up_trap
diff --git a/ttcn3-bsc-test-vamos/Dockerfile b/ttcn3-bsc-test-vamos/Dockerfile
index 1923c385..a29e0008 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-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-bsc-test/Dockerfile b/ttcn3-bsc-test/Dockerfile
index 1923c385..a29e0008 100644
--- a/ttcn3-bsc-test/Dockerfile
+++ b/ttcn3-bsc-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-bscnat-test/Dockerfile b/ttcn3-bscnat-test/Dockerfile
index 50ca9269..15e7727e 100644
--- a/ttcn3-bscnat-test/Dockerfile
+++ b/ttcn3-bscnat-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-bts-test/Dockerfile b/ttcn3-bts-test/Dockerfile
index 8ac7cb85..d676bf03 100644
--- a/ttcn3-bts-test/Dockerfile
+++ b/ttcn3-bts-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-cbc-test/Dockerfile b/ttcn3-cbc-test/Dockerfile
index 8eba25f6..7c1e6c59 100644
--- a/ttcn3-cbc-test/Dockerfile
+++ b/ttcn3-cbc-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-fr-test/Dockerfile b/ttcn3-fr-test/Dockerfile
index 4a70c121..11589f6b 100644
--- a/ttcn3-fr-test/Dockerfile
+++ b/ttcn3-fr-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-gbproxy-test/Dockerfile b/ttcn3-gbproxy-test/Dockerfile
index 71494d90..a2216b2d 100644
--- a/ttcn3-gbproxy-test/Dockerfile
+++ b/ttcn3-gbproxy-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-ggsn-test/Dockerfile b/ttcn3-ggsn-test/Dockerfile
index d42ac3ec..252e8931 100644
--- a/ttcn3-ggsn-test/Dockerfile
+++ b/ttcn3-ggsn-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-hlr-test/Dockerfile b/ttcn3-hlr-test/Dockerfile
index 84802882..ac5ca4f9 100644
--- a/ttcn3-hlr-test/Dockerfile
+++ b/ttcn3-hlr-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-hnodeb-test/Dockerfile b/ttcn3-hnodeb-test/Dockerfile
index 9659dd10..2071cab8 100644
--- a/ttcn3-hnodeb-test/Dockerfile
+++ b/ttcn3-hnodeb-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-mgw-test/Dockerfile b/ttcn3-mgw-test/Dockerfile
index 087dc09d..c8eeb2b7 100644
--- a/ttcn3-mgw-test/Dockerfile
+++ b/ttcn3-mgw-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-msc-test/Dockerfile b/ttcn3-msc-test/Dockerfile
index 05610a47..8c67bbfa 100644
--- a/ttcn3-msc-test/Dockerfile
+++ b/ttcn3-msc-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-nitb-sysinfo/Dockerfile b/ttcn3-nitb-sysinfo/Dockerfile
index 45bf69e6..31552718 100644
--- a/ttcn3-nitb-sysinfo/Dockerfile
+++ b/ttcn3-nitb-sysinfo/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-ns-test/Dockerfile b/ttcn3-ns-test/Dockerfile
index 850046d8..b94de1ba 100644
--- a/ttcn3-ns-test/Dockerfile
+++ b/ttcn3-ns-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-pcap-client-test/Dockerfile b/ttcn3-pcap-client-test/Dockerfile
index 2a3799fb..9e66326d 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-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-pcu-test/Dockerfile b/ttcn3-pcu-test/Dockerfile
index e42bca1c..b7cb21a5 100644
--- a/ttcn3-pcu-test/Dockerfile
+++ b/ttcn3-pcu-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-remsim-test/Dockerfile b/ttcn3-remsim-test/Dockerfile
index caa6da1f..e94c55c6 100644
--- a/ttcn3-remsim-test/Dockerfile
+++ b/ttcn3-remsim-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-sccp-test/Dockerfile b/ttcn3-sccp-test/Dockerfile
index 708a72f8..f43a5dd8 100644
--- a/ttcn3-sccp-test/Dockerfile
+++ b/ttcn3-sccp-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-sgsn-test/Dockerfile b/ttcn3-sgsn-test/Dockerfile
index 333b5ed7..b581b43a 100644
--- a/ttcn3-sgsn-test/Dockerfile
+++ b/ttcn3-sgsn-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-sip-test/Dockerfile b/ttcn3-sip-test/Dockerfile
index 1324ac0a..7dd4756d 100644
--- a/ttcn3-sip-test/Dockerfile
+++ b/ttcn3-sip-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-smlc-test/Dockerfile b/ttcn3-smlc-test/Dockerfile
index 5d27cebb..0d5b0da0 100644
--- a/ttcn3-smlc-test/Dockerfile
+++ b/ttcn3-smlc-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit
diff --git a/ttcn3-stp-test/Dockerfile b/ttcn3-stp-test/Dockerfile
index e36935b5..7808704d 100644
--- a/ttcn3-stp-test/Dockerfile
+++ b/ttcn3-stp-test/Dockerfile
@@ -1,6 +1,6 @@
 ARG	REGISTRY
 ARG	USER
-FROM	$REGISTRY/$USER/debian-stretch-titan
+FROM	$REGISTRY/$USER/debian-bullseye-titan
 ARG	OSMO_TTCN3_BRANCH="master"
 
 ADD	http://git.osmocom.org/osmo-ttcn3-hacks/patch?h=$OSMO_TTCN3_BRANCH /tmp/commit