diff --git a/webhooks/webhook.py b/webhooks/webhook.py
index a5b81c8..239951f 100755
--- a/webhooks/webhook.py
+++ b/webhooks/webhook.py
@@ -169,7 +169,7 @@ def bump_revision(request: Request, pr_infos: dict) -> HTTPResponse:
 
         manifest_file = (folder / "manifest.toml")
         manifest = tomlkit.load(manifest_file.open("r", encoding="utf-8"))
-        version, revision = manifest["version"].as_string().split("~ynh")
+        version, revision = manifest["version"].split("~ynh")
         revision = str(int(revision) + 1)
         manifest["version"] = "~ynh".join([version, revision])
         tomlkit.dump(manifest, manifest_file.open("w", encoding="utf-8"))