diff --git a/lib/tasks/release.rake b/lib/tasks/release.rake
index 69261e8..255d3e4 100644
--- a/lib/tasks/release.rake
+++ b/lib/tasks/release.rake
@@ -3,6 +3,9 @@ namespace :release do
   task :prepare do
     raise "Use this task in development only" unless Rails.env.development?
 
+    # Fetch remote
+    system("git fetch origin")
+
     # detect merged PR
     old_version = FluentdUI::VERSION
     pr_numbers = `git log v#{old_version}..master --oneline`.scan(/#[0-9]+/)