diff --git a/build.gradle.kts b/build.gradle.kts
index 64a0cbc..8a5dd62 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -47,13 +47,13 @@ dependencies {
     implementation(libs.spring.boot.starter.jpa)
     implementation(libs.mybatis.starter.core)
     implementation(libs.flyway.core)
-    implementation(libs.flyway.mysql)
+    implementation(libs.flyway.postgresql)
     implementation(libs.jackson.jsr310)
     implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.16")
     testImplementation(libs.spring.boot.starter.test)
     testImplementation(libs.reactor.test)
     testImplementation(libs.mybatis.starter.test)
-    runtimeOnly(libs.mysql.driver)
+    runtimeOnly(libs.postgres.driver)
     testRuntimeOnly(libs.h2.database)
     testRuntimeOnly(libs.junit.launcher)
 }
diff --git a/src/main/resources/db/migration/V2__init.sql b/src/main/resources/db/migration/V2__init.sql
index 332f98e..acbaad1 100644
--- a/src/main/resources/db/migration/V2__init.sql
+++ b/src/main/resources/db/migration/V2__init.sql
@@ -4,21 +4,21 @@ DROP TABLE IF EXISTS modification CASCADE;
 
 CREATE TABLE IF NOT EXISTS firearm
 (
-    id     BIGINT      NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    id     BIGSERIAL   NOT NULL PRIMARY KEY,
     name   VARCHAR(64) NOT NULL,
     type   INT         NOT NULL,
-    level  INT         NOT NULL,
+    level  VARCHAR(10) NOT NULL,
     review TEXT        NULL
 );
 
 
 CREATE TABLE IF NOT EXISTS modification
 (
-    id         BIGINT       NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    id         BIGSERIAL    NOT NULL PRIMARY KEY,
     firearm_id BIGINT       NOT NULL,
     name       VARCHAR(64)  NOT NULL,
     code       VARCHAR(64)  NOT NULL,
-    tags       JSON         NULL,
+    tags       JSONB        NULL,
     note       TEXT         NULL,
     author     VARCHAR(64)  NULL,
     video_url  VARCHAR(512) NULL,
diff --git a/src/main/resources/db/migration/V3__alter_firearm_level.sql b/src/main/resources/db/migration/V3__alter_firearm_level.sql
deleted file mode 100644
index 3d70fc0..0000000
--- a/src/main/resources/db/migration/V3__alter_firearm_level.sql
+++ /dev/null
@@ -1,2 +0,0 @@
-ALTER TABLE firearm
-    MODIFY level VARCHAR(2) NOT NULL;