diff --git a/app/forms/silo-access.tsx b/app/forms/silo-access.tsx
index 6bc711230..dd1388c99 100644
--- a/app/forms/silo-access.tsx
+++ b/app/forms/silo-access.tsx
@@ -18,6 +18,9 @@ import { Access16Icon } from '@oxide/design-system/icons/react'
 
 import { ListboxField } from '~/components/form/fields/ListboxField'
 import { SideModalForm } from '~/components/form/SideModalForm'
+import { HL } from '~/components/HL'
+import { useCurrentUser } from '~/hooks/use-current-user'
+import { confirmAction } from '~/stores/confirm-action'
 import { SideModalFormDocs } from '~/ui/lib/ModalLinks'
 import { ResourceLabel } from '~/ui/lib/SideModal'
 import { docLinks } from '~/util/links'
@@ -86,6 +89,7 @@ export function SiloAccessEditUserSideModal({
   policy,
   defaultValues,
 }: EditRoleModalProps) {
+  const { me } = useCurrentUser()
   const updatePolicy = useApiMutation(api.policyUpdate, {
     onSuccess: () => {
       queryClient.invalidateEndpoint('policyView')
@@ -106,9 +110,31 @@ export function SiloAccessEditUserSideModal({
         </ResourceLabel>
       }
       onSubmit={({ roleName }) => {
-        updatePolicy.mutate({
-          body: updateRole({ identityId, identityType, roleName }, policy),
-        })
+        const body = updateRole({ identityId, identityType, roleName }, policy)
+        // Only silo admins can edit the policy, so an admin who removes their
+        // own admin role may not be able to undo the change. "May" because
+        // they could still be an admin through a group.
+        if (
+          identityId === me.id &&
+          defaultValues.roleName === 'admin' &&
+          roleName !== 'admin'
+        ) {
+          confirmAction({
+            actionType: 'danger',
+            doAction: () => updatePolicy.mutateAsync({ body }),
+            modalTitle: 'Remove your own admin role',
+            modalContent: (
+              <p>
+                You are removing the <HL>admin</HL> role from your own account. You may lose
+                the ability to manage access to this silo, including restoring your own
+                role. Are you sure?
+              </p>
+            ),
+            errorTitle: 'Could not update role',
+          })
+          return
+        }
+        updatePolicy.mutate({ body })
       }}
       loading={updatePolicy.isPending}
       submitError={updatePolicy.error}
diff --git a/test/e2e/silo-access.e2e.ts b/test/e2e/silo-access.e2e.ts
index 720ef8ba1..3713a4082 100644
--- a/test/e2e/silo-access.e2e.ts
+++ b/test/e2e/silo-access.e2e.ts
@@ -80,3 +80,41 @@ test('Click through silo access page', async ({ page }) => {
   await page.getByRole('button', { name: 'Confirm' }).click()
   await expect(user3Row).toBeHidden()
 })
+
+// changing your own role away from admin requires confirmation because you
+// may not be able to undo it
+test('Removing your own admin role requires confirmation', async ({ page }) => {
+  await page.goto('/access')
+
+  const table = page.getByRole('table')
+
+  // Hannah Arendt is the mock session user and a silo admin
+  const openEditForm = async () => {
+    await page
+      .getByRole('row', { name: 'Hannah Arendt' })
+      .getByRole('button', { name: 'Row actions' })
+      .click()
+    await page.getByRole('menuitem', { name: 'Change role' }).click()
+    await page.getByRole('radio', { name: /^Viewer / }).click()
+    await page.getByRole('button', { name: 'Update role' }).click()
+  }
+  const editForm = page.getByRole('dialog', { name: 'Edit role' })
+  const confirmModal = page.getByRole('dialog', { name: 'Remove your own admin role' })
+
+  // confirmation modal pops up over the side modal. cancel out of it, then
+  // close the form and check nothing changed
+  await openEditForm()
+  await expect(confirmModal).toBeVisible()
+  await confirmModal.getByRole('button', { name: 'Cancel' }).click()
+  await expect(confirmModal).toBeHidden()
+  await expect(editForm).toBeVisible()
+  await editForm.getByRole('button', { name: 'Cancel' }).click()
+  await expectRowVisible(table, { Name: 'Hannah Arendt', Role: 'silo.admin' })
+
+  // this time, confirm
+  await openEditForm()
+  await confirmModal.getByRole('button', { name: 'Confirm' }).click()
+
+  await expect(editForm).toBeHidden()
+  await expectRowVisible(table, { Name: 'Hannah Arendt', Role: 'silo.viewer' })
+})