diff --git a/packages/adapter-libsql/src/libsql.test.ts b/packages/adapter-libsql/src/libsql.test.ts
index 182d06bd7f73..baed733a2006 100644
--- a/packages/adapter-libsql/src/libsql.test.ts
+++ b/packages/adapter-libsql/src/libsql.test.ts
@@ -208,6 +208,39 @@ describe.each([
     await expect(tx.rollback()).resolves.toBeUndefined()
     expect(factory.transaction.rollback).toHaveBeenCalledTimes(1)
   })
+
+  // https://github.com/prisma/prisma/issues/30028: a failed COMMIT must not leave the
+  // underlying connection inside an open write transaction, since the transaction manager
+  // never sends a real ROLLBACK for phantom-query adapters after a failed commit.
+  test('attempts a rollback and rethrows the original error when commit fails', async () => {
+    const factory = new PrismaLibSqlAdapterFactoryMock({ url: ':memory:' })
+    const conn = await connect(factory)
+    const tx = await conn.startTransaction('SERIALIZABLE')
+
+    const commitError = new Error('commit boom')
+    factory.transaction.commit.mockRejectedValueOnce(commitError)
+
+    await expect(tx.commit()).rejects.toBe(commitError)
+    expect(factory.transaction.rollback).toHaveBeenCalledTimes(1)
+    expect(factory.transaction.close).not.toHaveBeenCalled()
+  })
+
+  test('closes the transaction and preserves the commit error when cleanup rollback fails', async () => {
+    const factory = new PrismaLibSqlAdapterFactoryMock({ url: ':memory:' })
+    const conn = await connect(factory)
+    const tx = await conn.startTransaction('SERIALIZABLE')
+
+    const commitError = new Error('commit boom')
+    factory.transaction.commit.mockRejectedValueOnce(commitError)
+    factory.transaction.rollback.mockRejectedValueOnce(new Error('cleanup boom'))
+    factory.transaction.close.mockImplementationOnce(() => {
+      throw new Error('close boom')
+    })
+
+    await expect(tx.commit()).rejects.toBe(commitError)
+    expect(factory.transaction.rollback).toHaveBeenCalledTimes(1)
+    expect(factory.transaction.close).toHaveBeenCalledTimes(1)
+  })
 })
 
 class PrismaLibSqlAdapterFactoryMock extends PrismaLibSqlAdapterFactoryBase {
diff --git a/packages/adapter-libsql/src/libsql.ts b/packages/adapter-libsql/src/libsql.ts
index 8eab92839e86..b21bf4411a95 100644
--- a/packages/adapter-libsql/src/libsql.ts
+++ b/packages/adapter-libsql/src/libsql.ts
@@ -113,6 +113,23 @@ class LibSqlTransaction extends LibSqlQueryable<TransactionClient> implements Tr
 
     try {
       await this.client.commit()
+    } catch (error) {
+      // A failed COMMIT leaves the underlying connection inside an open write
+      // transaction, holding the SQLite write lock indefinitely: the transaction
+      // manager does not send a real COMMIT/ROLLBACK for phantom-query adapters,
+      // so this is the only place that can clean it up. Best-effort: a secondary
+      // rollback failure must not replace the original commit error.
+      try {
+        await this.client.rollback()
+      } catch (rollbackError) {
+        debug('Error while cleaning up connection after failed commit: %O', rollbackError)
+        try {
+          this.client.close()
+        } catch (closeError) {
+          debug('Error while closing transaction after failed cleanup rollback: %O', closeError)
+        }
+      }
+      throw error
     } finally {
       this.#unlockParent()
     }