diff --git a/PlainSql.Migrations/Migrator.cs b/PlainSql.Migrations/Migrator.cs
index 34cf615..4807756 100644
--- a/PlainSql.Migrations/Migrator.cs
+++ b/PlainSql.Migrations/Migrator.cs
@@ -31,7 +31,7 @@ public static void ExecuteMigrations(this IDbConnection connection, IEnumerable<
 
         public static void ExecuteMigrations(this IDbConnection connection, IEnumerable<MigrationScript> migrationScripts, MigrationOptions options)
         {
-            using (var transaction = connection.BeginTransaction())
+            using (var transaction = connection.BeginTransaction(IsolationLevel.Serializable))
             {
                 var containsMigrationTable = false;
 
diff --git a/README.md b/README.md
index 3f1be9f..6082813 100644
--- a/README.md
+++ b/README.md
@@ -42,3 +42,9 @@ private void ExecuteMigrations(string connectionString, string environment)
 * SQLite
 * MS SQL
 * PostgreSQL
+
+## Concurrency
+
+Migrations are executed in a single transaction with isolation level "Serializable". This usually
+means that executing migrations is concurrency-safe. For details on which SQL statements are supported
+by this transaction level, please refer to the documentation of your database technology.