diff --git a/.forgejo/workflows/deploy.yaml b/.forgejo/workflows/deploy.yaml
index 496bfc0..c44da2c 100644
--- a/.forgejo/workflows/deploy.yaml
+++ b/.forgejo/workflows/deploy.yaml
@@ -13,7 +13,7 @@ jobs:
   build:
     runs-on: docker
     container:
-      image: hugomods/hugo:exts-0.156.0
+      image: hugomods/hugo:exts-0.158.0
     steps:
       - name: Pipeline info
         run: |
diff --git a/hugo.toml b/hugo.toml
index 3b2548b..62fb6ad 100644
--- a/hugo.toml
+++ b/hugo.toml
@@ -1,5 +1,5 @@
 baseURL = 'https://hamburg.ccc.de/'
-languageCode = 'de-de'
+locale = 'de-de'
 defaultContentLanguage = 'de'
 timeZone = 'Europe/Berlin'
 title = 'CCC Hansestadt Hamburg e.V.'
diff --git a/themes/ccchh/layouts/_default/rss.xml b/themes/ccchh/layouts/_default/rss.xml
index f4a91aa..baf0f96 100644
--- a/themes/ccchh/layouts/_default/rss.xml
+++ b/themes/ccchh/layouts/_default/rss.xml
@@ -37,7 +37,7 @@
     <link>{{ .Permalink }}</link>
     <description>Recent content {{ if ne .Title .Site.Title }}{{ with .Title }}in {{ . }} {{ end }}{{ end }}on {{ .Site.Title }}</description>
     <generator>Hugo</generator>
-    <language>{{ site.Language.LanguageCode }}</language>{{ with $authorEmail }}
+    <language>{{ site.Language.Locale }}</language>{{ with $authorEmail }}
     <managingEditor>{{.}}{{ with $authorName }} ({{ . }}){{ end }}</managingEditor>{{ end }}{{ with $authorEmail }}
     <webMaster>{{ . }}{{ with $authorName }} ({{ . }}){{ end }}</webMaster>{{ end }}{{ with .Site.Copyright }}
     <copyright>{{ . }}</copyright>{{ end }}{{ if not .Date.IsZero }}