diff --git a/db/migrate/006_change_github_id_to_bigint_in_pull_requests.rb b/db/migrate/006_change_github_id_to_bigint_in_pull_requests.rb
new file mode 100644
index 0000000..56fa54b
--- /dev/null
+++ b/db/migrate/006_change_github_id_to_bigint_in_pull_requests.rb
@@ -0,0 +1,5 @@
+class ChangeGithubIdToBigintInPullRequests < Rails.version < '5.1' ? ActiveRecord::Migration : ActiveRecord::Migration[4.2]
+  def change
+    change_column :pull_requests, :github_id, :bigint, null: false
+  end
+end