diff --git a/deployments/a11y/image/apt.txt b/deployments/a11y/image/apt.txt
index d13c51d1d..24dad6eac 100644
--- a/deployments/a11y/image/apt.txt
+++ b/deployments/a11y/image/apt.txt
@@ -34,3 +34,7 @@ ruby
 
 # Other niceties for command-line work and life
 rsync
+
+# Add chromium to the a11y image for testing with pa11y
+chromium-browser
+
diff --git a/deployments/a11y/image/postBuild b/deployments/a11y/image/postBuild
index e2c9129d3..c8631e697 100644
--- a/deployments/a11y/image/postBuild
+++ b/deployments/a11y/image/postBuild
@@ -1,8 +1,9 @@
 #!/usr/bin/env bash
 set -eux
 
-# install pa11y for DH-169
+# install pa11y tools for DH-169
 
-npm install -g pa11y-ci
+npm install -g pa11y-ci@3.1.0
+npm install -g pa11y@6.2.3