diff --git a/stacks/jupyterhub-keycloak/jupyterhub.yaml b/stacks/jupyterhub-keycloak/jupyterhub.yaml
index 59aec283..62382588 100644
--- a/stacks/jupyterhub-keycloak/jupyterhub.yaml
+++ b/stacks/jupyterhub-keycloak/jupyterhub.yaml
@@ -203,8 +203,12 @@ options:
               "{{cpu}}":
                 display_name: "{{cpu}}"
                 kubespawner_override:
-                  cpu_guarantee: "{{cpu}}"
-                  cpu_limit: "{{cpu}}"
+                  # We cannot quote these values because both fields MUST be a float, not a string.
+                  # The Kubernetes notation (eg. 500m) is also not supported.
+                  # See https://github.com/jupyterhub/helm-chart/issues/69
+                  # This leads to this file being skipped in the Helm Chart bump script. Beware!
+                  cpu_guarantee: {{cpu}}
+                  cpu_limit: {{cpu}}
 # {% endfor %}
           memory:
             display_name: Memory