diff --git a/libs/common/src/abstractions/api.service.ts b/libs/common/src/abstractions/api.service.ts
index 44b5e34a4a4..cabde4093c4 100644
--- a/libs/common/src/abstractions/api.service.ts
+++ b/libs/common/src/abstractions/api.service.ts
@@ -228,16 +228,6 @@ export abstract class ApiService {
     request: CipherBulkRestoreRequest,
   ) => Promise<ListResponse<CipherResponse>>;
 
-  /**
-   * @deprecated Mar 25 2021: This method has been deprecated in favor of direct uploads.
-   * This method still exists for backward compatibility with old server versions.
-   */
-  postCipherAttachmentLegacy: (id: string, data: FormData) => Promise<CipherResponse>;
-  /**
-   * @deprecated Mar 25 2021: This method has been deprecated in favor of direct uploads.
-   * This method still exists for backward compatibility with old server versions.
-   */
-  postCipherAttachmentAdminLegacy: (id: string, data: FormData) => Promise<CipherResponse>;
   postCipherAttachment: (
     id: string,
     request: AttachmentRequest,
diff --git a/libs/common/src/services/api.service.ts b/libs/common/src/services/api.service.ts
index 1971cd86363..a2cc86a57ad 100644
--- a/libs/common/src/services/api.service.ts
+++ b/libs/common/src/services/api.service.ts
@@ -639,24 +639,6 @@ export class ApiService implements ApiServiceAbstraction {
     return new AttachmentUploadDataResponse(r);
   }
 
-  /**
-   * @deprecated Mar 25 2021: This method has been deprecated in favor of direct uploads.
-   * This method still exists for backward compatibility with old server versions.
-   */
-  async postCipherAttachmentLegacy(id: string, data: FormData): Promise<CipherResponse> {
-    const r = await this.send("POST", "/ciphers/" + id + "/attachment", data, true, true);
-    return new CipherResponse(r);
-  }
-
-  /**
-   * @deprecated Mar 25 2021: This method has been deprecated in favor of direct uploads.
-   * This method still exists for backward compatibility with old server versions.
-   */
-  async postCipherAttachmentAdminLegacy(id: string, data: FormData): Promise<CipherResponse> {
-    const r = await this.send("POST", "/ciphers/" + id + "/attachment-admin", data, true, true);
-    return new CipherResponse(r);
-  }
-
   deleteCipherAttachment(id: string, attachmentId: string): Promise<any> {
     return this.send("DELETE", "/ciphers/" + id + "/attachment/" + attachmentId, null, true, true);
   }
diff --git a/libs/common/src/vault/services/file-upload/cipher-file-upload.service.ts b/libs/common/src/vault/services/file-upload/cipher-file-upload.service.ts
index 4dd2f7f7338..10fa1d9580c 100644
--- a/libs/common/src/vault/services/file-upload/cipher-file-upload.service.ts
+++ b/libs/common/src/vault/services/file-upload/cipher-file-upload.service.ts
@@ -6,7 +6,6 @@ import {
   FileUploadApiMethods,
   FileUploadService,
 } from "../../../platform/abstractions/file-upload/file-upload.service";
-import { Utils } from "../../../platform/misc/utils";
 import { EncArrayBuffer } from "../../../platform/models/domain/enc-array-buffer";
 import { EncString } from "../../../platform/models/domain/enc-string";
 import { SymmetricCryptoKey } from "../../../platform/models/domain/symmetric-crypto-key";
@@ -47,18 +46,7 @@ export class CipherFileUploadService implements CipherFileUploadServiceAbstracti
         this.generateMethods(uploadDataResponse, response, request.adminRequest),
       );
     } catch (e) {
-      if (
-        (e instanceof ErrorResponse && (e as ErrorResponse).statusCode === 404) ||
-        (e as ErrorResponse).statusCode === 405
-      ) {
-        response = await this.legacyServerAttachmentFileUpload(
-          request.adminRequest,
-          cipher.id,
-          encFileName,
-          encData,
-          dataEncKey[1],
-        );
-      } else if (e instanceof ErrorResponse) {
+      if (e instanceof ErrorResponse) {
         throw new Error((e as ErrorResponse).getSingleMessage());
       } else {
         throw e;
@@ -113,50 +101,4 @@ export class CipherFileUploadService implements CipherFileUploadServiceAbstracti
       }
     };
   }
-
-  /**
-   * @deprecated Mar 25 2021: This method has been deprecated in favor of direct uploads.
-   * This method still exists for backward compatibility with old server versions.
-   */
-  async legacyServerAttachmentFileUpload(
-    admin: boolean,
-    cipherId: string,
-    encFileName: EncString,
-    encData: EncArrayBuffer,
-    key: EncString,
-  ) {
-    const fd = new FormData();
-    try {
-      const blob = new Blob([encData.buffer], { type: "application/octet-stream" });
-      fd.append("key", key.encryptedString);
-      fd.append("data", blob, encFileName.encryptedString);
-    } catch (e) {
-      if (Utils.isNode && !Utils.isBrowser) {
-        fd.append("key", key.encryptedString);
-        fd.append(
-          "data",
-          Buffer.from(encData.buffer) as any,
-          {
-            filepath: encFileName.encryptedString,
-            contentType: "application/octet-stream",
-          } as any,
-        );
-      } else {
-        throw e;
-      }
-    }
-
-    let response: CipherResponse;
-    try {
-      if (admin) {
-        response = await this.apiService.postCipherAttachmentAdminLegacy(cipherId, fd);
-      } else {
-        response = await this.apiService.postCipherAttachmentLegacy(cipherId, fd);
-      }
-    } catch (e) {
-      throw new Error((e as ErrorResponse).getSingleMessage());
-    }
-
-    return response;
-  }
 }