diff --git a/config/clusters/dubois/ephemeral.values.yaml b/config/clusters/dubois/ephemeral.values.yaml
index ff19de0f7..a1ebc9f49 100644
--- a/config/clusters/dubois/ephemeral.values.yaml
+++ b/config/clusters/dubois/ephemeral.values.yaml
@@ -15,6 +15,8 @@ jupyterhub:
     config:
       JupyterHub:
         authenticator_class: tmp
+      Authenticator:
+        allow_all: True
   custom:
     singleuserAdmin:
       # Turn off trying to mount shared-readwrite folder for admins
diff --git a/config/clusters/hhmi/spyglass.values.yaml b/config/clusters/hhmi/spyglass.values.yaml
index 93ec1a666..a55d60aa1 100644
--- a/config/clusters/hhmi/spyglass.values.yaml
+++ b/config/clusters/hhmi/spyglass.values.yaml
@@ -105,3 +105,5 @@ jupyterhub:
     config:
       JupyterHub:
         authenticator_class: tmp
+      Authenticator:
+        allow_all: True
diff --git a/docs/howto/features/ephemeral.md b/docs/howto/features/ephemeral.md
index 3c1c84096..a1aa8f34e 100644
--- a/docs/howto/features/ephemeral.md
+++ b/docs/howto/features/ephemeral.md
@@ -38,6 +38,8 @@ jupyterhub:
     config:
       JupyterHub:
         authenticator_class: tmp
+      Authenticator:
+        allow_all: True
 ```