diff --git a/src/pages.go b/src/pages.go
index 2394dce..aea858e 100644
--- a/src/pages.go
+++ b/src/pages.go
@@ -770,7 +770,7 @@ func postPage(w http.ResponseWriter, r *http.Request) error {
 		result := UpdateFromRepository(ctx, webRoot, repoURL, auth.branch)
 		resultChan <- result
 		observeSiteUpdate("webhook", &result)
-	}(r.Context())
+	}(context.WithoutCancel(r.Context()))
 
 	var result UpdateResult
 	select {