diff --git a/hieradata/roles/infra/puppet/master.yaml b/hieradata/roles/infra/puppet/master.yaml
index 3f7e584..f1a7010 100644
--- a/hieradata/roles/infra/puppet/master.yaml
+++ b/hieradata/roles/infra/puppet/master.yaml
@@ -35,6 +35,7 @@ profiles::puppet::gems::puppet:
   - 'deep_merge'
   - 'ipaddr'
   - 'hiera-eyaml'
+  - 'toml'
 
 profiles::helpers::certmanager::vault_config:
   addr: 'https://vault.service.consul:8200'