diff --git a/src/main/kotlin/fr/postgresjson/migration/Function.kt b/src/main/kotlin/fr/postgresjson/migration/Function.kt
index 5efd2ec..8fe1193 100644
--- a/src/main/kotlin/fr/postgresjson/migration/Function.kt
+++ b/src/main/kotlin/fr/postgresjson/migration/Function.kt
@@ -37,7 +37,7 @@ data class Function(
         connection.sendQuery(up.script)
 
         this::class.java.classLoader.getResource("sql/migration/insertFunction.sql")!!.readText().let {
-            connection.selectOne<MigrationEntity>(it, listOf(up))?.let { function ->
+            connection.selectOne<MigrationEntity>(it, listOf(up.name, up.getDefinition(), up.script, down.script))?.let { function ->
                 executedAt = function.executedAt
                 doExecute = Action.OK
             }
diff --git a/src/main/kotlin/fr/postgresjson/migration/Migrations.kt b/src/main/kotlin/fr/postgresjson/migration/Migrations.kt
index 230dfb9..a799136 100644
--- a/src/main/kotlin/fr/postgresjson/migration/Migrations.kt
+++ b/src/main/kotlin/fr/postgresjson/migration/Migrations.kt
@@ -37,10 +37,12 @@ data class Migrations private constructor(
     private val queries: MutableMap<String, Query> = mutableMapOf(),
     private val functions: MutableMap<String, Function> = mutableMapOf()
 ) {
-    constructor(directory: File, connection: Connection): this(connection) {
+    constructor(directory: File, connection: Connection): this(listOf(directory), connection)
+
+    constructor(directories: List<File>, connection: Connection): this(connection) {
         initDB()
         getMigrationFromDB()
-        getMigrationFromDirectory(directory)
+        getMigrationFromDirectory(directories)
         queries.forEach { (_, query) ->
             if (query.doExecute === null) {
                 query.doExecute = Action.DOWN
@@ -75,6 +77,15 @@ data class Migrations private constructor(
         }
     }
 
+    /**
+     * Get all migration from multiples Directories
+     */
+    private fun getMigrationFromDirectory(directory: List<File>) {
+        directory.forEach {
+            getMigrationFromDirectory(it)
+        }
+    }
+
     /**
      * Get all migration from Directory
      */
diff --git a/src/main/resources/sql/migration/createFunctionShema.sql b/src/main/resources/sql/migration/createFunctionShema.sql
index 0495d68..1512815 100644
--- a/src/main/resources/sql/migration/createFunctionShema.sql
+++ b/src/main/resources/sql/migration/createFunctionShema.sql
@@ -9,5 +9,3 @@ CREATE TABLE IF NOT EXISTS migration.functions
     down        text                    NOT NULL,
     version     int                     NOT NULL
 );
-
-CREATE SEQUENCE IF NOT EXISTS migration.version_seq;
\ No newline at end of file
diff --git a/src/main/resources/sql/migration/getNextVersion.sql b/src/main/resources/sql/migration/getNextVersion.sql
deleted file mode 100644
index 904b21b..0000000
--- a/src/main/resources/sql/migration/getNextVersion.sql
+++ /dev/null
@@ -1 +0,0 @@
-SELECT nextval('migration.version_seq');
\ No newline at end of file
diff --git a/src/main/resources/sql/migration/insertFunction.sql b/src/main/resources/sql/migration/insertFunction.sql
index 1c40057..6fa31d5 100644
--- a/src/main/resources/sql/migration/insertFunction.sql
+++ b/src/main/resources/sql/migration/insertFunction.sql
@@ -1,3 +1,7 @@
 INSERT INTO migration.functions as f (filename, definition, executed_at, up, down, version)
-VALUES (?, ?, now(), ?, ?, ?)
+VALUES (?, ?, now(), ?, ?, (
+    select coalesce(max(version), 0)+1
+    from migration.functions f2
+    where filename = f2.filename
+))
 RETURNING to_json(f);
\ No newline at end of file
diff --git a/src/main/resources/sql/migration/insertHistory.sql b/src/main/resources/sql/migration/insertHistory.sql
index 98dd96d..0cb1d47 100644
--- a/src/main/resources/sql/migration/insertHistory.sql
+++ b/src/main/resources/sql/migration/insertHistory.sql
@@ -1,3 +1,7 @@
 INSERT INTO migration.history as h (filename, executed_at, up, down, version)
-VALUES (?, now(), ?, ?, nextval('migration.version_seq'))
+VALUES (?, now(), ?, ?, (
+    select coalesce(max(version), 0)+1
+    from migration.history f2
+    where filename = f2.filename
+))
 RETURNING to_json(h);
diff --git a/src/test/kotlin/fr/postgresjson/MigrationTest.kt b/src/test/kotlin/fr/postgresjson/MigrationTest.kt
index 7420f8e..cc4e4a1 100644
--- a/src/test/kotlin/fr/postgresjson/MigrationTest.kt
+++ b/src/test/kotlin/fr/postgresjson/MigrationTest.kt
@@ -1,11 +1,13 @@
 package fr.postgresjson
 
+import fr.postgresjson.connexion.Requester
 import fr.postgresjson.migration.Migration
 import fr.postgresjson.migration.Migrations
 import org.amshove.kluent.`should be equal to`
 import org.amshove.kluent.`should contain`
 import org.amshove.kluent.invoking
 import org.amshove.kluent.shouldThrow
+import org.junit.jupiter.api.Assertions
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.TestInstance
 import java.io.File
@@ -32,6 +34,18 @@ class MigrationTest(): TestAbstract() {
         } shouldThrow Migrations.DownMigrationNotDefined::class
     }
 
+    @Test
+    fun `run forced down query`() {
+        val resources = File(this::class.java.getResource("/sql/migrations").toURI())
+        val m = Migrations(resources, getConnextion())
+        repeat(3) {
+            m.down(true).apply {
+                this `should contain` Pair("1", Migration.Status.OK)
+                size `should be equal to` 1
+            }
+        }
+    }
+
     @Test
     fun `run dry migrations`() {
         val resources = File(this::class.java.getResource("/sql/real_migrations").toURI())
@@ -76,4 +90,20 @@ class MigrationTest(): TestAbstract() {
             }
         }
     }
+
+    @Test
+    fun `run functions migrations`() {
+        val resources = File(this::class.java.getResource("/sql/function").toURI())
+        Migrations(resources, getConnextion()).apply {
+            run().size `should be equal to` 4
+        }
+
+        val objTest: RequesterTest.ObjTest? = Requester(getConnextion())
+            .addFunction(resources)
+            .getFunction("test_function")
+            .selectOne(listOf("test", "plip"))
+
+        Assertions.assertEquals(objTest!!.id, 3)
+        Assertions.assertEquals(objTest.name, "test")
+    }
 }
\ No newline at end of file