diff --git a/images/rl-requirements.txt b/images/rl-requirements.txt
index 3cdedad..b473c36 100644
--- a/images/rl-requirements.txt
+++ b/images/rl-requirements.txt
@@ -4,7 +4,7 @@ polars
 plotnine
 PyYaml
 huggingface_hub
-ibis-framework
+ibis-framework[duckdb]
 ray[rllib,tune]
 stable-baselines3
 sb3-contrib
diff --git a/jupyterhub/public-config.yaml b/jupyterhub/public-config.yaml
index 46a6840..8156040 100644
--- a/jupyterhub/public-config.yaml
+++ b/jupyterhub/public-config.yaml
@@ -70,8 +70,6 @@ singleuser:
           unlisted_choice:
             enabled: True
             display_name: "Custom image"
-            validation_regex: "^.+:.+$"
-            validation_message: "Must be a publicly available docker image, of form <image-name>:<tag>"
             kubespawner_override:
               image: "{value}"
           choices: {}