diff --git a/migrations/000009_versions_commit_time_not_null.down.sql b/migrations/000009_versions_commit_time_not_null.down.sql
new file mode 100644
index 00000000..d11effc9
--- /dev/null
+++ b/migrations/000009_versions_commit_time_not_null.down.sql
@@ -0,0 +1,5 @@
+-- Copyright 2009 The Go Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style
+-- license that can be found in the LICENSE file.
+
+ALTER TABLE versions ALTER COLUMN commit_time DROP NOT NULL;
diff --git a/migrations/000009_versions_commit_time_not_null.up.sql b/migrations/000009_versions_commit_time_not_null.up.sql
new file mode 100644
index 00000000..c9acb5b8
--- /dev/null
+++ b/migrations/000009_versions_commit_time_not_null.up.sql
@@ -0,0 +1,5 @@
+-- Copyright 2009 The Go Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style
+-- license that can be found in the LICENSE file.
+
+ALTER TABLE versions ALTER COLUMN commit_time SET NOT NULL;