diff --git a/.gitea/workflows/convert.yaml b/.gitea/workflows/convert.yaml
index 898a979..cd9397c 100644
--- a/.gitea/workflows/convert.yaml
+++ b/.gitea/workflows/convert.yaml
@@ -16,7 +16,7 @@ env:
 
 jobs:
   convert:
-    runs-on: ubuntu-latest
+    runs-on: cth-ubuntu-latest
     steps:
       - name: install dependencies
         run: |