diff --git a/changelog.md b/changelog.md
index 0aa11f2..c6bfc96 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## 2025-04-26 - 6.3.1 - fix(core)
+Improve nested DNS record management and worker script multipart handling
+
+- Add tests for creating, updating, and removing nested subdomain A records
+- Refine TXT record cleaning by filtering records with matching name and type
+- Clarify multipart form data handling for worker script updates and creation
+
 ## 2025-04-26 - 6.3.0 - feat(core)
 Release 6.2.0: Improved async iterator support, enhanced error handling and refined API interfaces for better type safety and consistent behavior.
 
diff --git a/test/test.ts b/test/test.ts
index 3231072..537791b 100644
--- a/test/test.ts
+++ b/test/test.ts
@@ -149,6 +149,52 @@ tap.test('should update A record content', async (tools) => {
   console.log(`Updated A record for ${subdomain} to 192.168.1.1`);
 });
 
+// Nested subdomain DNS record tests
+tap.test('should create A record for nested subdomain', async (tools) => {
+  tools.timeout(600000);
+  const nestedSubdomain = `${randomPrefix}-nested.sub.bleu.de`;
+  const result = await testCloudflareAccount.convenience.createRecord(
+    nestedSubdomain,
+    'A',
+    '127.0.0.5',
+    120
+  );
+  expect(result).toBeTypeOf('object');
+  console.log(`Created nested A record for ${nestedSubdomain}`);
+});
+
+tap.test('should get A record for nested subdomain', async (tools) => {
+  tools.timeout(600000);
+  const nestedSubdomain = `${randomPrefix}-nested.sub.bleu.de`;
+  const record = await testCloudflareAccount.convenience.getRecord(nestedSubdomain, 'A');
+  expect(record).toBeTypeOf('object');
+  expect(record.content).toEqual('127.0.0.5');
+  console.log(`Successfully retrieved nested A record for ${nestedSubdomain}`);
+});
+
+tap.test('should update A record for nested subdomain', async (tools) => {
+  tools.timeout(600000);
+  const nestedSubdomain = `${randomPrefix}-nested.sub.bleu.de`;
+  const result = await testCloudflareAccount.convenience.updateRecord(
+    nestedSubdomain,
+    'A',
+    '127.0.0.6',
+    120
+  );
+  expect(result).toBeTypeOf('object');
+  expect(result.content).toEqual('127.0.0.6');
+  console.log(`Updated nested A record for ${nestedSubdomain}`);
+});
+
+tap.test('should remove nested subdomain A record', async (tools) => {
+  tools.timeout(600000);
+  const nestedSubdomain = `${randomPrefix}-nested.sub.bleu.de`;
+  await testCloudflareAccount.convenience.removeRecord(nestedSubdomain, 'A');
+  const record = await testCloudflareAccount.convenience.getRecord(nestedSubdomain, 'A');
+  expect(record).toBeUndefined();
+  console.log(`Successfully removed nested A record for ${nestedSubdomain}`);
+});
+
 tap.test('should clean TXT records', async (tools) => {
   tools.timeout(600000);
   const subdomain = `${randomPrefix}-txt-test.bleu.de`;
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 97adb66..368fbfe 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@apiclient.xyz/cloudflare',
-  version: '6.3.0',
+  version: '6.3.1',
   description: 'A TypeScript client for managing Cloudflare accounts, zones, DNS records, and workers with ease.'
 }
diff --git a/ts/cloudflare.classes.account.ts b/ts/cloudflare.classes.account.ts
index 442aa25..7f952dc 100644
--- a/ts/cloudflare.classes.account.ts
+++ b/ts/cloudflare.classes.account.ts
@@ -229,15 +229,17 @@ export class CloudflareAccount {
         const domain = new plugins.smartstring.Domain(domainNameArg);
         const zoneId = await this.convenience.getZoneId(domain.zoneName);
         
-        const records = await this.convenience.listRecords(domainNameArg);
+        // List all records in the zone for this domain
+        const records = await this.convenience.listRecords(domain.zoneName);
         
         if (!Array.isArray(records)) {
           logger.log('warn', `Expected records array for ${domainNameArg} but got ${typeof records}`);
           return;
         }
         
+        // Only delete records matching the specified name and type
         const recordsToDelete = records.filter((recordArg) => {
-          return recordArg.type === typeArg;
+          return recordArg.type === typeArg && recordArg.name === domainNameArg;
         });
         
         logger.log('info', `Found ${recordsToDelete.length} ${typeArg} records to delete for ${domainNameArg}`);
diff --git a/ts/cloudflare.classes.worker.ts b/ts/cloudflare.classes.worker.ts
index a1edc6d..10c3e33 100644
--- a/ts/cloudflare.classes.worker.ts
+++ b/ts/cloudflare.classes.worker.ts
@@ -167,11 +167,15 @@ export class CloudflareWorker {
     try {
       logger.log('info', `Updating script for worker ${this.id}`);
       
-      // Use the official client to update the script
+      // Use the official client to update the script (upload new content)
       const updatedWorker = await this.workerManager.cfAccount.apiAccount.workers.scripts.content.update(this.id, {
         account_id: this.workerManager.cfAccount.preselectedAccountId,
-        "CF-WORKER-BODY-PART": scriptContent,
-        metadata: {}
+        // name the multipart part for the updated script code
+        metadata: { body_part: 'script' },
+        /* header to indicate which part contains the script */
+        'CF-WORKER-BODY-PART': 'script',
+        // include the new script as a form part named 'script'
+        script: scriptContent,
       });
       
       // Update this instance with new data
diff --git a/ts/cloudflare.classes.workermanager.ts b/ts/cloudflare.classes.workermanager.ts
index 445216c..9a32073 100644
--- a/ts/cloudflare.classes.workermanager.ts
+++ b/ts/cloudflare.classes.workermanager.ts
@@ -22,11 +22,15 @@ export class WorkerManager {
     }
     
     try {
-      // Use the official client to create/update the worker
+      // Use the official client to create/update the worker (upload script content)
       await this.cfAccount.apiAccount.workers.scripts.content.update(workerName, {
         account_id: this.cfAccount.preselectedAccountId,
-        "CF-WORKER-BODY-PART": workerScript,
-        metadata: {}
+        // name the multipart part for the script code
+        metadata: { body_part: 'script' },
+        /* header to indicate which part contains the script */
+        'CF-WORKER-BODY-PART': 'script',
+        // include the actual script as a form part named 'script'
+        script: workerScript,
       });
       
       // Create a new worker instance