diff --git a/backend/prisma/migrations/20221013212615_cascade_delete_on_share/migration.sql b/backend/prisma/migrations/20221013212615_cascade_delete_on_share/migration.sql
new file mode 100644
index 0000000..1ca00d6
--- /dev/null
+++ b/backend/prisma/migrations/20221013212615_cascade_delete_on_share/migration.sql
@@ -0,0 +1,14 @@
+-- RedefineTables
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_RefreshToken" (
+    "token" TEXT NOT NULL PRIMARY KEY,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "expiresAt" DATETIME NOT NULL,
+    "userId" TEXT NOT NULL,
+    CONSTRAINT "RefreshToken_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+INSERT INTO "new_RefreshToken" ("createdAt", "expiresAt", "token", "userId") SELECT "createdAt", "expiresAt", "token", "userId" FROM "RefreshToken";
+DROP TABLE "RefreshToken";
+ALTER TABLE "new_RefreshToken" RENAME TO "RefreshToken";
+PRAGMA foreign_key_check;
+PRAGMA foreign_keys=ON;
diff --git a/backend/prisma/schema.prisma b/backend/prisma/schema.prisma
index 31f749e..883832b 100644
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@@ -28,7 +28,7 @@ model RefreshToken {
   expiresAt DateTime
 
   userId String
-  user   User   @relation(fields: [userId], references: [id])
+  user   User   @relation(fields: [userId], references: [id], onDelete: Cascade)
 }
 
 model Share {