diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 4e29a5d7..aeed46f5 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -44,7 +44,7 @@ jobs:
             irods: "4.3.1"
             client_image: "ghcr.io/wtsi-npg/ub-22.04-irods-clients-4.3.1:latest"
             server_image: "ghcr.io/wtsi-npg/ub-22.04-irods-4.3.1:latest"
-            experimental: false
+            experimental: true
           - perl: "5.22.4"
             irods: "4.3.0"
             client_image: "ghcr.io/wtsi-npg/ub-22.04-irods-clients-4.3-nightly:latest"