diff --git a/.buildkite/scripts/test_old_deps.sh b/.buildkite/scripts/test_old_deps.sh
index 3753f41a4..9270d55f0 100755
--- a/.buildkite/scripts/test_old_deps.sh
+++ b/.buildkite/scripts/test_old_deps.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# this script is run by buildkite in a plain `xenial` container; it installs the
+# this script is run by buildkite in a plain `bionic` container; it installs the
 # minimal requirements for tox and hands over to the py3-old tox environment.
 
 set -ex