diff --git a/client/client.go b/client/client.go
index 74798bef..b64dfd5b 100644
--- a/client/client.go
+++ b/client/client.go
@@ -74,11 +74,11 @@ type Client struct {
 func New(optionalSetters ...ClientOption) Client {
 	headers := map[string]string{
 		"X-Appwrite-Response-Format" : "1.9.5",
-		"user-agent" : fmt.Sprintf("AppwriteGoSDK/v4.0.0 (%s; %s)", runtime.GOOS, runtime.GOARCH),
+		"user-agent" : fmt.Sprintf("AppwriteGoSDK/v4.1.0 (%s; %s)", runtime.GOOS, runtime.GOARCH),
 		"x-sdk-name": "Go",
 		"x-sdk-platform": "server",
 		"x-sdk-language": "go",
-		"x-sdk-version": "v4.0.0",
+		"x-sdk-version": "v4.1.0",
 	}
 	httpClient, err := GetDefaultClient(defaultTimeout)
 	if err != nil {
@@ -148,6 +148,22 @@ func isFileUpload(headers map[string]interface{}) bool {
 	return false
 }
 
+func copyHeaders(headers map[string]interface{}) map[string]interface{} {
+	clone := make(map[string]interface{}, len(headers))
+	for key, value := range headers {
+		clone[key] = value
+	}
+	return clone
+}
+
+func copyParams(params map[string]interface{}) map[string]interface{} {
+	clone := make(map[string]interface{}, len(params))
+	for key, value := range params {
+		clone[key] = value
+	}
+	return clone
+}
+
 func (client *Client) FileUpload(url string, headers map[string]interface{}, params map[string]interface{}, paramName string, uploadId string) (*ClientResponse, error) {
 	inputFile, ok := params[paramName].(file.InputFile)
 	if !ok {
@@ -178,6 +194,7 @@ func (client *Client) FileUpload(url string, headers map[string]interface{}, par
 	if uploadId != "" {
 		resp, err := client.Call("GET", url+"/"+uploadId, nil, nil)
 		if err == nil {
+			result = resp
 			var result map[string]interface{}
 			if resStr, ok := resp.Result.(string); ok {
 				_ = json.Unmarshal([]byte(resStr), &result)
@@ -217,40 +234,148 @@ func (client *Client) FileUpload(url string, headers map[string]interface{}, par
 		return result, nil
 	}
 
-	for i := currentChunk; i < numChunks; i++ {
+	parseUploadId := func(resp *ClientResponse) string {
+		var parsed map[string]interface{}
+		if resp != nil && strings.HasPrefix(resp.Type, "application/json") {
+			if unmarshalErr := json.Unmarshal([]byte(resp.Result.(string)), &parsed); unmarshalErr == nil {
+				id, _ := parsed["$id"].(string)
+				return id
+			}
+		}
+		return ""
+	}
+
+	isUploadComplete := func(resp *ClientResponse) bool {
+		if resp == nil || !strings.HasPrefix(resp.Type, "application/json") {
+			return false
+		}
+
+		var parsed map[string]interface{}
+		if resStr, ok := resp.Result.(string); ok {
+			_ = json.Unmarshal([]byte(resStr), &parsed)
+		} else {
+			parsed, _ = resp.Result.(map[string]interface{})
+		}
+		if parsed == nil || parsed["chunksUploaded"] == nil {
+			return false
+		}
+
+		chunksUploaded, ok := parsed["chunksUploaded"].(float64)
+		if !ok {
+			return false
+		}
+		chunksTotal := float64(numChunks)
+		if value, ok := parsed["chunksTotal"].(float64); ok {
+			chunksTotal = value
+		}
+
+		return chunksUploaded >= chunksTotal
+	}
+
+	uploadChunk := func(i int64, id string) (*ClientResponse, error) {
 		chunkSize := client.ChunkSize
-		offset := int64(i) * chunkSize
+		offset := i * client.ChunkSize
 		if i == numChunks-1 {
 			chunkSize = fileInfo.Size() - offset
-			inputFile.Data = make([]byte, chunkSize)
 		}
-		_, err := file.ReadAt(inputFile.Data, offset)
+
+		chunkFile := inputFile
+		chunkFile.Data = make([]byte, chunkSize)
+		_, err := file.ReadAt(chunkFile.Data, offset)
 		if err != nil && err != io.EOF {
 			return nil, err
 		}
-		params[paramName] = inputFile
-		if uploadId != "" {
-			headers["x-appwrite-id"] = uploadId
+
+		chunkParams := copyParams(params)
+		chunkParams[paramName] = chunkFile
+		chunkHeaders := copyHeaders(headers)
+		if id != "" {
+			chunkHeaders["x-appwrite-id"] = id
 		}
+
 		totalSize := fileInfo.Size()
 		start := offset
-		end := offset + client.ChunkSize - 1
-		if end >= totalSize {
-			end = totalSize - 1
-		}
-		headers["content-range"] = fmt.Sprintf("bytes %d-%d/%d", start, end, totalSize)
-		result, err = client.Call("POST", url, headers, params)
+		end := offset + chunkSize - 1
+		chunkHeaders["content-range"] = fmt.Sprintf("bytes %d-%d/%d", start, end, totalSize)
+
+		return client.Call("POST", url, chunkHeaders, chunkParams)
+	}
+
+	if currentChunk == 0 {
+		result, err = uploadChunk(0, uploadId)
 		if err != nil {
 			return nil, err
 		}
+		if id := parseUploadId(result); id != "" {
+			uploadId = id
+		}
+		currentChunk = 1
+	}
 
-		var parsed map[string]interface{}
-		if strings.HasPrefix(result.Type, "application/json") {
-			err = json.Unmarshal([]byte(result.Result.(string)), &parsed)
-			if err == nil {
-				uploadId, _ = parsed["$id"].(string)
+	type chunkResult struct {
+		index int64
+		resp  *ClientResponse
+		err   error
+	}
+
+	remainingChunks := numChunks - currentChunk
+	if remainingChunks <= 0 {
+		return result, nil
+	}
+
+	concurrency := int64(8)
+	if remainingChunks < concurrency {
+		concurrency = remainingChunks
+	}
+
+	jobs := make(chan int64)
+	results := make(chan chunkResult, int(remainingChunks))
+	done := make(chan struct{})
+
+	for worker := int64(0); worker < concurrency; worker++ {
+		go func() {
+			for {
+				select {
+				case <-done:
+					return
+				case i, ok := <-jobs:
+					if !ok {
+						return
+					}
+					resp, err := uploadChunk(i, uploadId)
+					results <- chunkResult{index: i, resp: resp, err: err}
+				}
+			}
+		}()
+	}
+
+	go func() {
+		defer close(jobs)
+		for i := currentChunk; i < numChunks; i++ {
+			select {
+			case <-done:
+				return
+			case jobs <- i:
 			}
 		}
+	}()
+
+	var lastResult *ClientResponse
+	completeFound := false
+	for i := int64(0); i < remainingChunks; i++ {
+		chunk := <-results
+		if chunk.err != nil {
+			close(done)
+			return nil, chunk.err
+		}
+		lastResult = chunk.resp
+		if isUploadComplete(chunk.resp) {
+			result = chunk.resp
+			completeFound = true
+		}
+	}
+	if !completeFound && lastResult != nil {
+		result = lastResult
 	}
 	return result, nil
 }