diff --git a/ci/test/00_setup_env.sh b/ci/test/00_setup_env.sh
index 3d0ee4f6c2..0db0f0b459 100755
--- a/ci/test/00_setup_env.sh
+++ b/ci/test/00_setup_env.sh
@@ -50,7 +50,7 @@ export RUN_SYMBOL_TESTS=${RUN_SYMBOL_TESTS:-false}
 export EXPECTED_TESTS_DURATION_IN_SECONDS=${EXPECTED_TESTS_DURATION_IN_SECONDS:-1000}
 
 export CONTAINER_NAME=${CONTAINER_NAME:-ci_unnamed}
-export DOCKER_NAME_TAG=${DOCKER_NAME_TAG:-ubuntu:focal}
+export DOCKER_NAME_TAG=${DOCKER_NAME_TAG:-ubuntu:20.04}
 # Randomize test order.
 # See https://www.boost.org/doc/libs/1_71_0/libs/test/doc/html/boost_test/utf_reference/rt_param_reference/random.html
 export BOOST_TEST_RANDOM=${BOOST_TEST_RANDOM:-1}