diff --git a/src/Transloadit.ts b/src/Transloadit.ts
index efd6a91..b686188 100644
--- a/src/Transloadit.ts
+++ b/src/Transloadit.ts
@@ -159,7 +159,6 @@ export class Transloadit {
     const {
       params = {},
       waitForCompletion = false,
-      isResumable = true,
       chunkSize: requestedChunkSize = Infinity,
       uploadConcurrency = 10,
       timeout = 24 * 60 * 60 * 1000, // 1 day
@@ -170,13 +169,6 @@ export class Transloadit {
       assemblyId,
     } = opts
 
-    if (!isResumable) {
-      process.emitWarning(
-        'Parameter value isResumable = false is deprecated. All uploads will be resumable (using TUS) in the future',
-        'DeprecationWarning'
-      )
-    }
-
     // Keep track of how long the request took
     const startTimeMs = getHrTimeMs()
 
@@ -242,25 +234,15 @@ export class Transloadit {
           method: 'post',
           timeout,
           params,
-        }
-
-        if (isResumable) {
-          requestOpts.fields = {
+          fields: {
             tus_num_expected_upload_files: allStreams.length,
-          }
+          },
         }
 
-        // upload as form multipart or tus?
-        const formUploadStreamsMap: Record<string, Stream> = isResumable ? {} : allStreamsMap
-
-        const result = await this._remoteJson<Assembly>(
-          requestOpts,
-          formUploadStreamsMap,
-          onUploadProgress
-        )
+        const result = await this._remoteJson<Assembly>(requestOpts)
         checkResult(result)
 
-        if (isResumable && Object.keys(allStreamsMap).length > 0) {
+        if (Object.keys(allStreamsMap).length > 0) {
           await sendTusRequest({
             streamsMap: allStreamsMap,
             assembly: result,
@@ -678,7 +660,6 @@ export class Transloadit {
   private _appendForm(
     form: FormData,
     params: KeyVal,
-    streamsMap?: Record<string, Stream>,
     fields?: Record<string, string | number>
   ): void {
     const sigData = this.calcSignature(params)
@@ -694,13 +675,6 @@ export class Transloadit {
     }
 
     form.append('signature', signature)
-
-    if (streamsMap) {
-      Object.entries(streamsMap).forEach(([label, { stream, path }]) => {
-        const options = path ? undefined : { filename: label } // https://github.com/transloadit/node-sdk/issues/86
-        form.append(label, stream, options)
-      })
-    }
   }
 
   // Implements HTTP GET query params, handling the case where the url already
@@ -743,11 +717,7 @@ export class Transloadit {
   // Responsible for making API calls. Automatically sends streams with any POST,
   // PUT or DELETE requests. Automatically adds signature parameters to all
   // requests. Also automatically parses the JSON response.
-  private async _remoteJson<T>(
-    opts: RequestOptions,
-    streamsMap?: Record<string, Stream>,
-    onProgress: CreateAssemblyOptions['onUploadProgress'] = () => {}
-  ): Promise<T> {
+  private async _remoteJson<T>(opts: RequestOptions): Promise<T> {
     const {
       urlSuffix,
       url: urlInput,
@@ -775,11 +745,9 @@ export class Transloadit {
 
       if (method === 'post' || method === 'put' || method === 'delete') {
         form = new FormData()
-        this._appendForm(form, params, streamsMap, fields)
+        this._appendForm(form, params, fields)
       }
 
-      const isUploadingStreams = streamsMap && Object.keys(streamsMap).length > 0
-
       const requestOpts: OptionsOfJSONResponseBody = {
         retry: this._gotRetry,
         body: form as FormData,
@@ -792,18 +760,8 @@ export class Transloadit {
         responseType: 'json',
       }
 
-      // For non-file streams transfer encoding does not get set, and the uploaded files will not get accepted
-      // https://github.com/transloadit/node-sdk/issues/86
-      // https://github.com/form-data/form-data/issues/394#issuecomment-573595015
-      if (isUploadingStreams) requestOpts.headers!['transfer-encoding'] = 'chunked'
-
       try {
         const request = got[method]<T>(url, requestOpts)
-        if (isUploadingStreams) {
-          request.on('uploadProgress', ({ transferred, total }) =>
-            onProgress({ uploadedBytes: transferred, totalBytes: total })
-          )
-        }
         const { body } = await request
         return body
       } catch (err) {
@@ -852,7 +810,6 @@ export interface CreateAssemblyOptions {
     [name: string]: Readable | intoStream.Input
   }
   waitForCompletion?: boolean
-  isResumable?: boolean
   chunkSize?: number
   uploadConcurrency?: number
   timeout?: number
diff --git a/test/integration/live-api.test.ts b/test/integration/live-api.test.ts
index 0b87779..4aa95b7 100644
--- a/test/integration/live-api.test.ts
+++ b/test/integration/live-api.test.ts
@@ -337,22 +337,19 @@ describe('API integration', { timeout: 60000 }, () => {
       expect(result.assembly_id).toMatch(promise.assemblyId)
     })
 
-    async function testUploadProgress(isResumable: boolean) {
+    async function testUploadProgress() {
       const client = createClient()
 
       let progressCalled = false
       function onUploadProgress({ uploadedBytes, totalBytes }: UploadProgress) {
         // console.log(uploadedBytes)
         expect(uploadedBytes).toBeDefined()
-        if (isResumable) {
-          expect(totalBytes).toBeDefined()
-          expect(totalBytes).toBeGreaterThan(0)
-        }
+        expect(totalBytes).toBeDefined()
+        expect(totalBytes).toBeGreaterThan(0)
         progressCalled = true
       }
 
       const params: CreateAssemblyOptions = {
-        isResumable,
         params: {
           steps: {
             resize: resizeOriginalStep,
@@ -368,12 +365,8 @@ describe('API integration', { timeout: 60000 }, () => {
       expect(progressCalled).toBe(true)
     }
 
-    it('should trigger progress callbacks when uploading files, resumable', async () => {
-      await testUploadProgress(true)
-    })
-
-    it('should trigger progress callbacks when uploading files, nonresumable', async () => {
-      await testUploadProgress(false)
+    it('should trigger progress callbacks when uploading files', async () => {
+      await testUploadProgress()
     })
 
     it('should return properly waitForCompletion is false', async () => {
diff --git a/test/unit/test-transloadit-client.test.ts b/test/unit/test-transloadit-client.test.ts
index 591f783..352b683 100644
--- a/test/unit/test-transloadit-client.test.ts
+++ b/test/unit/test-transloadit-client.test.ts
@@ -151,14 +151,6 @@ describe('Transloadit', () => {
     it('should append all required fields to the request form', () => {
       const client = new Transloadit({ authKey: 'foo_key', authSecret: 'foo_secret' })
 
-      const stream1 = new Readable()
-      const stream2 = new Readable()
-
-      const streamsMap = {
-        stream1: { stream: stream1 },
-        stream2: { stream: stream2 },
-      }
-
       const form = new FormData()
       const params = {}
       const fields = {
@@ -170,7 +162,7 @@ describe('Transloadit', () => {
       const formAppendSpy = vi.spyOn(form, 'append')
 
       // @ts-expect-error This tests private internals
-      client._appendForm(form, params, streamsMap, fields)
+      client._appendForm(form, params, fields)
 
       expect(calcSignatureSpy).toHaveBeenCalledWith(params)
 
@@ -181,8 +173,6 @@ describe('Transloadit', () => {
           'signature',
           'sha384:f146533532844d4f4e34221288be08e14a2779eeb802a35afa6a193762f58da95d2423a825aa4cb4c7420e25f75a5c90',
         ],
-        ['stream1', stream1, { filename: 'stream1' }],
-        ['stream2', stream2, { filename: 'stream2' }],
       ])
     })
   })
@@ -280,11 +270,7 @@ describe('Transloadit', () => {
 
     await client.createAssembly()
 
-    expect(spy).toBeCalledWith(
-      expect.objectContaining({ timeout: 24 * 60 * 60 * 1000 }),
-      {},
-      expect.any(Function)
-    )
+    expect(spy).toBeCalledWith(expect.objectContaining({ timeout: 24 * 60 * 60 * 1000 }))
   })
 
   describe('_calcSignature', () => {