/// note | In version 1.9.0 n8n changed the templating language for expressions
If you have issues with expressions in 1.9.0:
   
* Please report the issue on the [forums](https://community.n8n.io/){:target=_blank .external-link}.
* Self-hosted users can switch back to RiotTmpl: set `N8N_EXPRESSION_EVALUATOR` to `tmpl`.  Refer to [Environment variables](/hosting/environment-variables/) for more information on configuring self-hosted n8n.  
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