diff --git a/pool/boltupgrades.go b/pool/boltupgrades.go
index d56a1371..0ccf1eb7 100644
--- a/pool/boltupgrades.go
+++ b/pool/boltupgrades.go
@@ -637,11 +637,16 @@ func upgradeDB(db *BoltDB) error {
 		return err
 	}
 
-	if version >= BoltDBVersion {
+	if version == BoltDBVersion {
 		// No upgrades necessary.
 		return nil
 	}
 
+	if version > BoltDBVersion {
+		// Database is too new.
+		return fmt.Errorf("expected database version <= %d, got %d", BoltDBVersion, version)
+	}
+
 	log.Infof("Upgrading database from version %d to %d", version, BoltDBVersion)
 
 	return db.DB.Update(func(tx *bolt.Tx) error {