diff --git a/migrations/20181119152303_timestamps_to_bigint.js b/migrations/20181119152303_timestamps_to_bigint.js
new file mode 100644
index 0000000..de10dd2
--- /dev/null
+++ b/migrations/20181119152303_timestamps_to_bigint.js
@@ -0,0 +1,41 @@
+exports.up = function (knex, Promise) {
+  return Promise.all([
+    knex.schema.table('user', t => {
+      t.bigInteger('created_at')
+      t.bigInteger('updated_at')
+    }),
+    knex.schema.table('passport', t => {
+      t.bigInteger('created_at')
+      t.bigInteger('updated_at')
+    }),
+    knex.schema.table('targeturl', t => {
+      t.bigInteger('created_at')
+      t.bigInteger('updated_at')
+    }),
+    knex.schema.table('book', t => {
+      t.bigInteger('created_at')
+      t.bigInteger('updated_at')
+    })
+  ])
+}
+
+exports.down = function (knex, Promise) {
+  return Promise.all([
+    knex.schema.table('user', t => {
+      t.integer('created_at')
+      t.integer('updated_at')
+    }),
+    knex.schema.table('passport', t => {
+      t.integer('created_at')
+      t.integer('updated_at')
+    }),
+    knex.schema.table('targeturl', t => {
+      t.integer('created_at')
+      t.integer('updated_at')
+    }),
+    knex.schema.table('book', t => {
+      t.integer('created_at')
+      t.integer('updated_at')
+    })
+  ])
+}