diff --git a/pillar_tool/db/__init__.py b/pillar_tool/db/__init__.py
index 708e90c..f2c670d 100644
--- a/pillar_tool/db/__init__.py
+++ b/pillar_tool/db/__init__.py
@@ -1,9 +1,8 @@
-import os
-
-import alembic
+from os import lockf, F_LOCK
+from os.path import dirname, realpath
 
 from alembic.config import Config
-from alembic.command import upgrade
+from alembic.command import upgrade, check, util
 from pillar_tool.util import config
 
 
@@ -16,10 +15,12 @@ host = cfg.db.host
 port = cfg.db.port
 database = cfg.db.database
 alembic_cfg = Config()
-alembic_cfg.set_main_option('script_location', f'{os.path.dirname(os.path.realpath(__file__))}/migrations')
+alembic_cfg.set_main_option('script_location', f'{dirname(realpath(__file__))}/migrations')
 alembic_cfg.set_main_option('sqlalchemy.url', f'postgresql://{user}:{password}@{host}:{port}/{database}')
 alembic_cfg.set_main_option('prepend_sys_path', '.')
 
 
 def run_db_migrations():
-    upgrade(config=alembic_cfg, revision='head')
+    with open(realpath(__file__), 'a') as f:
+        lockf(f.fileno(), F_LOCK, 0)
+        upgrade(config=alembic_cfg, revision='head')